Police in Minneapolis arrested at least 51 people after a large demonstration obstructed traffic on Interstate 94. The protestors come after the shooting of a local African-American man by police. The FBI and Justice Department are launching a federal investigation into the shooting of the 24-year-old over the weekend. Protestors and local activists are demanding police release video of the shooting. Police, however, refused to say if video of the incident exists. The man who was shot, Jamar Clark was critically injured and is now in the hospital. The details of the shooting are disputed: Some protestors and witnesses say that Clark was unarmed and handcuffed when he was shot; police say a struggle happened after he interfered with paramedics assisting his girlfriend following a domestic assault.