DES MOINES, Iowa (AP) — Police say a man at a Des Moines homeless encampment has been shot after trying to evade officers and then threatening one of them with a knife. The shooting happened early Friday afternoon near the Martin Luther King Jr. Parkway Bridge over the Raccoon River.

Police Sgt. Paul Parizek says officers were responding to complaints about the homeless camp when a 26-year-old man there refused to cooperate with officers, then jumped into the river. Police say he later emerged from the river, ran back to the camp and armed himself first with a shovel, then a machete-style knife.

Police say he advanced on an officer, refusing commands to drop the knife, and was shot in the upper torso. Police have not released the man’s name, but say he underwent surgery and is expected to survive. Police also have not released the names of the officers involved.