(CNN) Four Houston police officers were shot and another suffered a knee injury Monday while serving a search warrant, police Chief Art Acevedo said.

About a dozen narcotics officers and several patrol officers responded to a residence where police suspected drugs were being sold, Acevedo told reporters Monday night. The narcotics officers announced themselves as they breached the front door shortly before 5 p.m. Then the gunfire started, Acevedo said.

"Immediately upon breaching the door, the officers came under fire from one or two suspects inside the house," the police chief said.

One suspect retreated to the back of a room, he said, then re-emerged and returned fire.

Four undercover narcotics officers were struck by gunfire, police said. A fifth officer suffered a knee injury, according to Acevedo.

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