CUTLER BAY, Fla. - A gunman killed a police officer and injured three others during a traffic stop Thursday, triggering a manhunt in a suburban Miami neighborhood, officials said. Miami-Dade County Mayor Carlos Alvarez confirmed that an officer died. The three survivors were in serious condition, police spokeswoman Linda O’Brien said.

The officers were conducting burglary surveillance when they stopped the man because he was driving a car erratically, said O’Brien. The man opened fire with a high-powered weapon and fled. It was not immediately clear whether the officers returned fire.

TV footage showed several officers briefly surrounding a house, guns drawn, before moving on. Others swept through a grassy area on foot and picked through a garbage truck.

Authorities were looking for Shawn Sherwin Labeet, 25. Authorities initially identified a different suspect as the gunman, but that person was actually hundreds of miles away in the Jacksonville area.

Labeet was last seen in neighboring Broward County in a black Pontiac, O’Brien said. The car was later found at a shopping mall parking lot in neighboring Broward County, but Labeet was not in it, she said. A man, a woman and two children found in the car were being questioned, she said.

Another man may have been involved in the shooting, she said.

Cutler Bay is a suburb southwest of downtown Miami. Several schools were locked down due to the search.

Two other officers were shot separately last month in neighboring Broward County. One was killed, the other badly injured.