SCRANTON (AP) — A northeastern Pennsylvania man is accused of attacking a Secret Service agent with brass knuckles and a chunk of asphalt.

Scranton Police Police Chief David Elliott says Agent William Slavoski tapped his siren Tuesday evening when a pickup truck that had been moving erratically on an expressway stopped in front of him. Police say the pickup driver got out and approached the agent, asking, "What are you, some kind of cop?"

Police say Slavoski identified himself as a Secret Service agent and told the man to return to his truck, but an altercation ensued. Police arrested 25-year-old Kenneth Kile of Kingston, who was arraigned Wednesday and held in lieu of $20,000 bail.

Slavoski is recovering at home from injuries to his face, head and left arm. Kile was treated for a lip laceration.