DAVE KILLEN/THE OREGONIAN VIA AP
In this July 10 photo, Federal officers pull a protester into the Federal Courthouse as protesters gather in downtown Portland, Ore. The mayor of Portland, Oregon said late Sunday, July 12, the U.S. Marshals Service are investigating the injury of a protester who was hospitalized in critical condition over the weekend after being hit in the head by an impact weapon fired by a federal law enforcement officer. Mayor Ted Wheeler said he spoke with with U.S. Attorney for Oregon Billy J. Williams and learned of the investigation.