These crawls are part of an effort to archive pages as they are created and archive the pages that they refer to. That way, as the pages that are referenced are changed or taken from the web, a link to the version that was live when the page was written will be preserved.Then the Internet Archive hopes that references to these archived pages will be put in place of a link that would be otherwise be broken, or a companion link to allow people to see what was originally intended by a page's authors.The goal is to fix all broken links on the web . Crawls of supported "No More 404" sites. ||||| Authorities are investigating whether an undercover police officer present at a motorcycle rally witnessed a violent confrontation between an SUV driver and a swarm of bikers and didn't immediately report it, a law enforcement official said Saturday. 
 
 This undated photo provided by his family's attorney on Friday, Oct. 4, 2013 shows Edwin Mieses Jr. Mieses was struck by an SUV during a motorcycle rally in New York that turned violent on Sunday, Sept.... (Associated Press) 
 
 Dayana Mejia, center, and attorney Gloria Allred, right, hold up a laptop with images of Mejia's partner, Edwin Mieses Jr., during a news conference in New York, Friday, Oct. 4, 2013. Mejia was struck... (Associated Press) 
 
 Attorney Gloria Allred, right, speaks as Edwin Mieses Sr., left, and Dayana Mejia listen during a news conference, Friday, Oct. 4, 2013, in New York. Mejia, the longtime girlfriend of biker Edwin Mieses... (Associated Press) 
 
 This undated photo provided by his family's attorney on Friday, Oct. 4, 2013 shows Edwin Mieses Jr. after he was struck by an SUV during a motorcycle rally in New York that turned violent on Sunday, Sept.... (Associated Press) 
 
 Attorney Gloria Allred, right, speaks as she puts her arm around Dayana Mejia during a news conference, Friday, Oct. 4, 2013, in New York. Mejia, the longtime girlfriend of biker Edwin Mieses Jr., who... (Associated Press) 
 
 The officer came forward several days after the Sept. 29 rally to say he was present, according to the official, who was not authorized to speak publicly about the investigation and spoke to The Associated Press on condition of anonymity. The officer has an attorney, and internal affairs detectives are trying to determine whether he witnessed the assault on the SUV driver, the official said. 
 
 New York Police Department spokesman John McCarthy said a detective had been stripped of his gun and badge pending the outcome of an internal affairs investigation. 
 
 McCarthy said internal affairs was investigating the case and looking into whether any off-duty officers may have been present. 
 
 Undercover officers are required to immediately report being a witness to a crime. Uniformed officers are required to take police action if they see a crime occurring, but the rules are murkier for undercover officers who face blowing their cover, confusing civilians who don't realize the undercover is really a cop and ruining yearslong investigations. 
 
 For example, Gescard Isnora, an undercover officer involved in the fatal police shooting of an unarmed man after his bachelor party in 2006, stepped out of his role and fired a shot as officers opened fire on Sean Bell and his friends. Isnora was fired and lost his pension after a departmental trial ruling that he should not have shot his weapon while undercover. 
 
 Last weekend, dozens of bikers stopped the Range Rover SUV on a highway, attacked the vehicle, then chased the driver and pulled him from the car after he plowed over a motorcyclist while trying to escape, police said. The driver, Alexian Lien, needed stiches after being pummeled by the bikers. 
 
 The motorcyclist who was crushed by the SUV, Edwin Mieses Jr., of Lawrence, Mass., suffered a broken spine and two broken legs and may never walk again, his family said. 
 
 Some of the encounter was captured on a camera mounted on the helmet of one of the bikers and was posted online. Investigators have been interviewing dozens of bikers and witnesses, but it still remains unclear how many people attacked Lien. On Saturday, police said two other motorcyclists were taken into custody and released a photograph of another man they say they want to question in connection with the attack. 
 
 Robert Sims, 35, of Brooklyn, was arrested on charges of gang assault and weapons possession. Police said he took part in the attack on Lien. There was no listed telephone number for Sims at the address where police said he lived. 
 
 He is the third person to face formal charges in connection with the attack, though the case against one of those motorcyclists was subsequently dismissed when prosecutors said they needed more time to investigate. 
 
 Police also detained another Brooklyn man Friday who they believed had participated in the attack. As of Saturday, formal charges had not been filed, authorities said. 
 
 Lien has not been charged. His wife said in a statement this week they feared for their lives as they drove off. 
 
 Mieses' family held a news conference Friday with their lawyer in which they said that he wasn't doing anything wrong when he was struck by Lien's SUV. They acknowledged that Mieses had stopped his bike in front of the family's vehicle but said he was trying to get the other riders to leave the family alone when he was hit. ||||| An off-duty undercover NYPD cop was among the pack of bikers who chased a family up the West Side Highway — and he stood by as the dad was hauled from his car and beaten, sources told The Post. 
 
 The unidentified officer waited three days to come forward Wednesday night. He has been placed on modified duty and turned in his gun and badge on Friday, the sources said. 
 
 He rides with the New Rochelle-based Front Line Soldiers, a club that also counts several other cops among its members, a source said. 
 
 Internal Affairs is investigating whether those cops, too, were among the bikers — and whether they also witnessed the assault that left Internet exec Alexian Lien bleeding on the pavement as his wife and toddler cowered in their black Range Rover. 
 
 “It does not appear that he got involved at the scene,” one law-enforcement source said of the undercover, who has hired a lawyer. “He didn’t want to blow his cover,” said the source — though the cop was not investigating the group of bikers. 
 
 Cops have uncovered new photo and video evidence showing that Lien was attacked by as many as five bikers, sources said. 
 
 One of those bikers was allegedly Robert Sims, 35, of Brooklyn. He was taken into custody Friday afternoon and charged with gang assault, assault, criminal possession of a weapon, attempted assault and attempted gang assault, a source said. 
 
 “Apparently he hit the guy,” the source said. 
 
 Reginald Chance, 38, of Brooklyn — depicted in video using his chrome-colored helmet to bash in Lien’s driver’s-side window — was also in custody Friday awaiting charges. Police plan to do lineups Saturday morning. 
 
 There is no evidence that he beat or slashed Lien, but Chance faces possible charges of gang assault, a source said. 
 
 Several other bikers at the center of the beatdown were also wearing chrome-colored helmets, hampering the investigation into Chance, a source said. 
 
 But the new stills and footage — which surfaced from non-biker Samaritans who pulled over to help Lien — have helped with the investigation. 
 
 Prosecutors re-interviewed the Liens on Friday afternoon and also planned on taking a closer look at the black Range Rover that was pursued from 125th Street up to 178th Street. 
 
 The battered vehicle was moved via flatbed Friday afternoon from a police lot to the 33rd Precinct in Washington Heights, where the investigation is based. 
 
 The Range Rover’s smashed windows are a record of the vehemence with which the berserk bikers tried to get at Lien, whose window was busted clean out. 
 
 Wife Rosalyn’s window was fully spider-webbed, and the rear window above the tailgate was also broken out completely. 
 
 The length of time it’s taken to start throwing thug bikers in handcuffs has irritated some investigators, who fault prosecutors for what they characterize as the DA’s methodical, wait-for-felony-evidence approach. 
 
 “You should slap them with the charges that you can prove, whether they’re lesser or more serious charges,” said one cop. “Later on, you can always upgrade or downgrade the charges.” 
 
 Besides Sims only one other biker has been charged in the rampage despite videos, still photos and non-biker witness accounts from the broad-daylight attack. 
 
 Christopher Cruz, 28, of Passaic, NJ, faces misdemeanor charges of reckless driving and imprisonment for suddenly slowing his bike in front of the Range Rover, causing the fender-bender blamed for sparking the chase and violence. 
 
 Meanwhile, the only biker injured during the rampage threatened he may sue Lien for running him over with the Range Rover when he hit the gas as his SUV was first surrounded. 
 
 “He was attempting to diffuse the situation,” lawyer Gloria Allred said of Edwin Mieses, 32, whom she said may be paralyzed from the waist down “for the rest of his life.” 
 
 Mieses hasn’t had a valid license in his home state of Massachusetts since 1999, and haas never applied for a motorcycle license. 
 
 Video by Kevin Fasick 
 
 Additional reporting by Kevin Fasick, Lia Eustachewich and Jennifer Bain
– One more twist in this week's bizarre story of a New York City driver getting assaulted by a group of motorcyclists in broad daylight: It looks like an undercover NYPD detective was there the whole time but chose not to intervene, reports the Daily News. The detective had been riding with the bikers and didn't want to blow his cover, though he wasn't investigating a specific crime, says the newspaper. He came forward days after the Sept. 29 assault and is now on restricted duty while an investigation takes place, reports the New York Post. It adds that other off-duty cops might have been present. The AP has the story, too, but it says investigators still aren't sure whether the detective actually witnessed the beating. It took place last weekend after dozens of bikers stopped an SUV and pulled the driver out after he had struck a motorcyclist in their group. That motorcyclist remains hospitalized and might never walk again. The driver needed stitches after the beating. So far, three of the motorcyclists have been charged.