Officers shot and critically injured a man they say fired on them with an assault-style rifle Sunday night, Clearwater police said.

Mark Wayne Bill, 56, underwent surgery overnight at Bayfront Medical Center and is in very critical condition, authorities said.

According to police, a relative of Bill contacted Clearwater police and expressed concern about a conversation he had with the man. The relative requested that officers check on Bill at his home in the 2200 block of Glenmoore Road.

Officers Kris Wise and Michael Beaver arrived about 7:15 p.m. and found Bill armed with an AR-15 semiautomatic rifle, they said.

The officers "backed away (and) attempted to make contact," Clearwater public safety spokesperson Elizabeth Watts said. "He came out of the house and shot at our officers. Our officers exchanged fire and hit him."

Bill's 15-year-old son, who was home at the time of the shooting, was not injured.

Wise and Beaver were not injured. They have been placed on administrative leave pending an investigation, which is standard procedure in officer-involved shootings.