FBI
Abdul-Baki Todashev, the father of Ibragim Todashev (the man who had confessed to the FBI the day before in Orlando, Florida, to working with Tamerlan Tsarnaev, the deceased older brother in the April 2013 Boston Marathon bombings, in a previously unsolved 2011 triple homicide, and subsequently while being questioned attacked an agent with a knife and was killed) claims that his son is innocent and that federal investigators are biased against Chechens and made up their case against him.
Sources: NBC