The two Kazakh students arrested Wednesday in the Boston Marathon bombing investigation are not accused of being part of the plot to set off the bombs, but questions have arisen about the license plate on the BMW they drove, which bore the words “Terrorista No. 1.” Azamat Tazhayakov and Dias Kadyrbayev come off as fun-loving teens who did not realize what they were getting into when they allegedly disposed of a backpack and laptop belonging to Dzhokhar Tsarnaev, who is accused of planting the bombs that killed three and injured more than 260. 
 
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 New developments: 
 
 -- The bombs used in the Boston Marathon attack were built in the apartment that suspect Tamerlan Tsarnaev shared with his wife and child, a U.S. law enforcement official with first-hand knowledge of the investigation told CNN on Thursday. The official was not authorized to release the information. 
 
 -- Suspected Boston Marathon bombers Tamerlan and Dzhokhar Tsarnaev initially planned to carry out an attack on July 4, but their bombs were ready earlier than they expected and they decided to move up the date, a U.S. law enforcement official told CNN on Thursday. 
 
 Previously reported developments: 
 
 -- The laptop computer belonging to bombings suspect Dzhokhar Tsarnaev has been turned over to the FBI by one of Tsarnaev's friends who has been charged with obstructing justice, Dias Kadyrbayev's lawyer told CNN on Thursday. A law enforcement source confirmed the attorney's account. 
 
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 -- The body of Tamerlan Tsarnaev was picked up Thursday from the Office of the Chief Medical Examiner of Massachusetts, a spokesman for the office told CNN. Tsarnaev's cause of death will not be made public until the death certificate is filed with Boston's city clerk's office, Terrel Harris said. 
 
 -- The Kazakhstan Foreign Ministry said it was offering consular services to Kadyrbayev and Azamat Tazhayakov, who were charged with obstructing justice in connection with the marathon bombings. "We would like to emphasize that our citizens did not receive charges of involvement in the organization of the Boston Marathon bombings. They were charged with destroying evidence," the ministry said in a statement. 
 
 -- Katherine Russell, widow of Tamerlan Tsarnaev, spoke to her husband after his picture appeared on national television as a suspect, two sources familiar with the investigation told CNN on Wednesday. The nature of the conversation remains under investigation, but the sources said there was some concern that Russell spoke with her husband but did not call authorities who were still seeking to identify the men in the photos. 
 
 -- Authorities said Wednesday that three additional suspects have been arrested in connection with the Boston Marathon bombings. The three men are accused of helping one of the bombing suspects, Dzhokhar Tsarnaev, after the April 15 attack, according to federal prosecutors. 
 
 -- An attorney for Kadyrbayev, one of the three 19-year-olds arrested Wednesday, disputed the allegations against his client and said Kadyrbayev did not know items he admitted to discarding "were involved in a bombing." 
 
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 -- Another of the suspects arrested Wednesday, Azamat Tazhayakov, is "shocked and horrified" to hear that someone he knew was involved in the bombings, attorney Harland Protass said. The attorney said his client has fully cooperated with authorities in the investigation and looks forward to the truth coming out. 
 
 -- Attorney Raymond A. O'Hara, who reportedly was appointed to represent Robel Phillipos, told CNN that the 19-year-old U.S. citizen has retained private counsel. 
 
 -- Kadyrbayev and Tazhayakov, who the FBI said are Kazakh nationals, and Phillipos were ordered Wednesday to return to court on May 14 for an evidentiary hearing, at which time a bail application is expected to be made. 
 
 -- About a month before the marathon attack, Dzhokhar Tsarnaev had told Kadyrbayev and Tazhayakov "that he knew how to make a bomb," according to an FBI affidavit recounting the charges. Kadyrbayev told investigators that Tsarnaev "appeared to have given himself a short haircut" two days after the bombings. 
 
 -- According to the affidavit, when the FBI on April 18 released photographs of bomb suspects later identified as Dzhokhar Tsarnaev and his older brother Tamerlan, Kadyrbayev texted his friend Dzhokhar to tell him "he looked like the suspect on television." Tsarnaev texted back "lol" and added, "come to my room and take whatever you want." Phillipos, Tazhayakov and Kadyrbayev went to the room, where Kadyrbayev noticed a backpack containing fireworks that had been "opened and emptied of powder," according to the affidavit. 
 
 "Kadyrbayev knew when he saw the empty fireworks that Tsarnaev was involved in the marathon bombing," the affidavit states. 
 
 -- Kadyrbayev and Tazhayakov are charged with "conspiracy to obstruct justice by conspiring to destroy, conceal and cover up tangible objects belonging to suspected Marathon bomber, Dzhokhar Tsarnaev, namely a laptop computer and backpack containing fireworks," according to the criminal complaint, released by the U.S. Attorney's Office, Massachusetts District. 
 
 -- Phillipos is charged with "willfully making materially false statements to federal law enforcement officials during a terrorism investigation," according to the complaint. 
 
 -- According to the affidavit accompanying the complaint, Kadyrbayev and Tazhayakov are both nationals of Kazakhstan who entered the U.S. on student visas. 
 
 -- Kadyrbayev, Tazhaykov, Phillipos and Tsarnaev began attending UMass Dartmouth at the same time in 2011, according to a criminal complaint filed by the FBI in U.S. District Court. Investigators originally thought Kadyrbayev was a student at the Massachusetts Institute of Technology; a screen grab of his Facebook page had him listed as being in MIT's class of 2015 and that he was in the school of engineering. 
 
 -- Murat Kadyrbayev, father Dias Kadyrbayev, said last week that his son and Tazhayakov own a BMW that garnered attention in the investigation. The car had a decorative license plate reading "Terrorista #1." The plate was a joke from friends in Spain, Murat Kadyrbayev told the Kazakh news website Tengri News and STV channel in an interview, Tengrinews.kz reported. 
 
 -- One of the reasons Kadyrbayev was of immediate interest involved activity on his Facebook page. The source says that while Dzhokhar was on the run -- at 3 a.m. on April 19, Kadyrbayev deleted a photo showing him and the suspect having dinner together, according to the source briefed on the investigation. 
 
 -- A federal law enforcement official told CNN the charge of conspiring to obstruct justice relates to their moving things from Dzhokhar Tsarnaev's dorm room and throwing them into a dumpster. The source said the objects disposed of included fireworks inside backpacks. The trash bin subsequently was taken to a nearby landfill. Authorities carried out a two-day search of the landfill in New Bedford late last week. ||||| Authorities are hoping to find new clues in the Boston Marathon bombing case by poring over a laptop belonging to one of the suspects and learning what the other told his wife in a phone call days after the blast, sources told ABC News. 
 
 Robert Stahl, an attorney for a friend of bombing suspect Dzhokhar Tsarnaev, said his client had taken Dzhokhar's laptop from his room but turned it over to the FBI "the very first time" agents came to see him late Friday, four days after the bombing. 
 
 Stahl's client, 19-year-old Dias Kadyrbayev, was charged along with another 19-year-old friend with conspiracy to obstruct justice for taking the laptop and allegedly trying to dump a backpack full of fireworks -- which had been emptied of their powder -- also belonging to Dzhokhar after they realized Dzhokhar was involved in the bombing. After the teens' court appearance Wednesday, Stahl denied his client knew Dzhokhar was involved in the attack at the time and said Kadyrbayev did not think the items were of evidentiary value. 
 
 A law enforcement official also told ABC News today that the FBI is seeking to find out what the other bombing suspect, Dzhokhar's older brother Tamerlan Tsarnaev, told his wife in a phone call shortly after the FBI released his photo to the public three days after the attack. The official said only the woman, Katherine Russell, knows the content of the conversation. 
 
 Russell's attorney said in a statement Tuesday that she was providing "as much assistance to the investigation as she can." 
 
 Tamerlan and Dzhokhar Tsarnaev are accused of planting two bombs near the finish line of the Boston Marathon on April 15. When the bombs exploded, three people were killed and more than 260 others were injured. Three days after the bombing the FBI released surveillance images of the suspects, who they had not yet identified, in hopes the public may be able to track them down. Hours later, Tamerlan was killed in a firefight with police. Dzhokhar escaped for a while but was injured and eventually caught on April 19. 
 
 Terrel Harris, a spokesperson for the Massachusetts Office of the Chief Medical Examiner, told ABC News that Tamerlan's body will be released from his office today to Tamerlan's family. 
 
 Wednesday authorities arrested three 19-year-old friends of Dzhokhar's: Dias Kadyrbayev and Azamat Tazhayakov, both students originally from Kazakhstan, and American Robel Phillipos. In addition to the conspiracy to obstruct charges against Kadyrbayev and Tazhayakov, Phillipos is charged with lying to federal investigators. 
 
 Attorneys for the Kazakh students said their clients had nothing to do with the bombings, and they disputed parts of the criminal complaint against their clients. An attorney for Phillipos reportedly said his client was not connected to the bombing or to the Kazakh students' actions and downplayed his client's alleged lies as "misrepresentations." 
 
 Charging documents filed Wednesday against Dzhokhar's friends revealed new details in the case, including an exchange that took place a month before the attack in which Dzhokhar allegedly bragged that he knew how to build explosive devices. Dzhokhar also allegedly responded to one of his friends who asked if was the suspect shown in FBI photos with "LOL." 
 
 READ MORE: Boston Suspect Month Before Attack: I Know How to Build a Bomb 
 
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 ABC News' Lee Ferran contributed to this report.
– The family of Tamerlan Tsarnaev—or at least the funeral home it hired—claimed his body from Massachusetts officials today, reports AP. Widow Katherine Russell agreed earlier this week to release it to his side of the family. It's not clear yet where Tamerlan will be buried, though the development at least means his official cause of death should be released soon. ABC News, meanwhile, has an interesting detail: A source says Tamerlan called his wife soon after the FBI released photos of the bombing suspects, but authorities have yet to learn what he said to her. Russell is now in Rhode Island. Also of note: The FBI does indeed have Dzhokhar's laptop and is examining it for evidence, reports both ABC and CNN. Its whereabouts had been unclear in the wake of the arrests of three of Dzhokhar's friends accused of trying to cover up evidence. A lawyer for one in the trio tells ABC that his client handed it over to the FBI the first time agents visited him, four days after the bombing. The three allegedly took it from Dzhokhar's room once they realized he was a prime suspect. Speaking of those friends, the Boston Globe reports that the Kazakh men, Azamat Tazhayakov and Dias Kadyrbayev, drove a BMW with the license plate "Terrorista #1" The father of one says it was a harmless joke.