The Redmond Fire Department (RFD) is investigating an apartment complex fire that left 10 residents displaced.

At 9:48 p.m. on May 23, RFD responded to a heavy fire at an apartment complex at 8222 169th Ave. NE. Residents had evacuated the building as multiple units had been damaged by the flames.

Multiple departments from other cities responded to the call as well, including Bellevue, Kirkland, Woodinville, Bothell fire departments and Eastside Fire and Rescue. By 10 p.m. the fire was under control.

Five apartment units sustained heavy damage and are not able to be reoccupied. Lisa Maher, communications and marketing manager RFD, said 10 residents have been displaced but have been provided housing by the Red Cross. Three people sustained minor injuries and were treated and released at the scene.

Maher said because the building was relatively old it did not have an automatic sprinkler system or remote system installed.

The fire department is currently investigating the cause behind the fire.