The hits keep coming for Lance Armstrong. The FBI is pursuing a surveillance video from a Colorado restaurant that they believe will show that Armstrong tried to tamper with federal witness Tyler Hamilton, one of the restaurant co-owners said. Federal authorities have been investigating possible steroid use by Armstrong for a year, and Hamilton is one of the witnesses in the case. According to Hamilton’s lawyer, Armstrong walked up to Hamilton Saturday night at the restaurant Cache Cache, and then Armstrong threw his arm to block Hamilton and then began berating him. Other witnesses called the conversation “intense,” but doubted there was any violence.