Thornton Police have arrested a 15-year-old boy in connection with the murder investigation of 10-year-old Kiaya Campbell, who went missing last week after last being seen with her 15-year-old stepbrother. 
 
 Police would not confirm if the boy arrested Saturday night was the same as the one last seen with Campbell. 
 
 “It’s still ongoing, and there are still things to tie up at this time,” said Officer Victor Avila, Thornton Police Department spokesman. “That’s why we’re keeping it close to the vest … to make sure we get a successful prosecution at the end of this.” 
 
 Courtesy Thornton Police Department Kiaya Campbell 
 
 Steve Nehf,The Denver Post Police and investigators from Thornton and Adams County comb the Riverdale Park area where a young girl's body was found Friday, June 9, 2017. Ten-year-old Kiaya Campbell went missing during a rainstorm Wednesday night and searches took place all day Thursday before the body was discovered in the early evening. 
 
 Steve Nehf,The Denver Post Police and investigators from Thornton and Adams County comb the Riverdale Park area where a young girl's body was found Friday, June 9, 2017. Ten-year-old Kiaya Campbell went missing during a rainstorm Wednesday night and searches took place all day Thursday before the body was discovered in the early evening. 
 
 Steve Nehf,The Denver Post Police and investigators from Thornton and Adams County comb the Riverdale Park area where a young girl's body was found Friday, June 9, 2017. Ten-year-old Kiaya Campbell went missing during a rainstorm Wednesday night and searches took place all day Thursday before the body was discovered in the early evening. 
 
 Helen H. Richardson, The Denver Post A Thornton police cruiser follows a member of the Jefferson County K-9 unit as they look for signs of missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Campbell had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 
 
 Helen H. Richardson, The Denver Post An FBI agent questions vehicles entering the neighborhood of missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Campbell had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Thornton police officers keep guard over the scene of where the body of a young girl has been found on June 8, 2017 in Thornton. Kiaya Campbell, 10, had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Alayah Maestas, 9 and her little sister Aleis, 7, joined in with hundreds of people at Skyview Elementary school to help in the search for missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Kiaya Campbell had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Hundreds of people turned out at Skyview Elementary school to help in the search for missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Kiaya Campbell had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Adams County sheriff deputies gather in the neighborhood of missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Campbell had been missing since late last night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 
 
 Helen H. Richardson, The Denver Post Thornton police officers and FBI agents question vehicles entering the neighborhood of missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Campbell had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Brooklyn Mitchell, 7 and her brother Ethan, 9 joined in with hundreds of people at Skyview Elementary school to help in the search for missing 10-year-old Kiaya Campbell on June 8, 2017 in Thornton. Kiaya Campbell had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Thornton police officers keep guard over the scene of where the body of a young girl has been found on June 8, 2017 in Thornton. Kiaya Campbell, 10, had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Helen H. Richardson, The Denver Post Two neighbors, who may have witnessed the body, are visibly shaken at the scene of where the body of a young girl has been found on June 8, 2017 in Thornton. Kiaya Campbell, 10, had been missing since late Wednesday night. Around 5:30 p.m. Thursday police called off the search as a body of a young girl had been found in the Riverdale Park neighborhood at Monoco Way and Jasmine Court. 
 
 Detectives with the Thornton police arrested a 15-year-old boy at 11:38 p.m. Saturday for investigation of first-degree murder before booking him and transporting him to the Adams County juvenile detention facility. 
 
 Because he is a juvenile, his name will not be released, Avila said. 
 
 Campbell disappeared Wednesday night while walking with her stepbrother from her home in the 12400 block of Forest Drive. Following an Amber Alert and an intensive search involving 23 rescue and law enforcement agencies, a child’s body was discovered Thursday afternoon in a greenbelt area about 1½ miles from where Campbell disappeared. 
 
 The Adams County coroner later identified the body as that of Campbell. The 15-year-old boy she was with told police that he ran and became separated from the girl when it began raining hard. Some neighbors disputed that there was a rainstorm that night. 
 
 Thornton police and Colorado Bureau of Investigation authorities are involved in the death investigation. Anyone with further information regarding this case is encouraged to call a tip line at 720-977-5069. ||||| THORNTON, Colo. (AP) — A 15-year-old boy has been arrested on suspicion of first-degree murder in the death of a 10-year-old Colorado girl. 
 
 Kiaya Campbell was reported missing in the city of Thornton on Wednesday, and her body was found the next day about 1.5 miles (2.4 kilometers) from her father's house. Investigators said her body had signs of severe trauma. 
 
 Kiaya was last seen with the 15-year-old son of her father's girlfriend. 
 
 Police wouldn't confirm if he was the boy arrested Saturday night. The girlfriend's son had reported that he and the girl had gotten separated during a thunderstorm. 
 
 Thornton police spokesman Victor Avila says that because the boy is a juvenile, his name will not be released. 
 
 Investigators didn't release other details, including a possible motive.
– A 15-year-old boy has been arrested on suspicion of first-degree murder in the death of a 10-year-old Colorado girl. Kiaya Campbell was reported missing in the city of Thornton on Wednesday, and her body was found the next day about 1.5 miles from her father's house, the AP reports. Investigators said her body had signs of severe trauma. Kiaya was last seen with the 15-year-old son of her father's girlfriend. Police wouldn't confirm if he was the boy arrested Saturday night. The girlfriend's son had told investigators that he and the girl had gotten separated during a thunderstorm, though some neighbors disputed that there was a storm that night, reports the Denver Post.