Question: Police officers, armed with model MarkV-A1, were shot at the end of a protest against police killings of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota, what was used to disable the shooter?  
Sentence (from "MarkV-A1"): Officers used the robot to deliver a charge of C4 which was then detonated next to the gunman.
Relevant evidence: Yes