Lawyers for Boston Marathon suspect, Dzhokhar Tsarnaev said Friday that repeated contacts by the FBI were among "precipitating events" leading up to the bombings, NBC News reported. In court documents filed Friday, defense lawyers asked the judge overseeing the case for an order requiring the government to turn over all records of the FBI's contacts with Tsarnaev's older brother, Tamerlan. He was interviewed by FBI agents in response to a concern expressed by the Russian government that he might become radicalized. They wrote that the Tsarnaev family and "other sources" have said that the FBI made more than one visit to talk to Tamerlan Tsarnaev and his parents, during which agents "questioned Tamerlan about his internet searches, and asked him to be an informant, reporting on the Chechen and Muslim community." The FBI's interview took place in 2011.