A small fire charred one room of a duplex in Long Beach’s Wrigley neighborhood Thursday morning, and authorities are still trying to determine what started the flames.

Nobody was hurt in the blaze, but medics assessed two Long Beach police officers and a civilian for smoke inhalation after crews quickly doused the blaze, LBFD Capt. Jack Crabtree said.

The flames started around 10:12 a.m. at a two-story duplex on Magnolia Avenue near 19th Street, according to Crabtree.

When firefighters arrived, smoke was coming from a room on the first floor. They attacked the blaze and had it doused within a few minutes, Crabtree said.

The blaze didn’t spread beyond the one room, but the damage means occupants of the unit will be displaced at least temporarily, he said.

Crabtree said it wasn’t immediately clear how the officers and civilian ended up with symptoms of smoke inhalation. It’s possible the civilian had been inside the home, he said, but everyone was out by the time fire crews arrived.