Waltham EMS responds to Lexington fire on Wednesday night

Waltham emergency medical services on Wednesday night responded to a call to assist a police officer after the officer was exposed to smoke during a house fire on Baskin Road in Lexington.

Firefighters arrived around 10 p.m. to find smoke coming from the home. Crews quickly contained the fire to a single room. 

Officials said the fire may have started from a computer that was left on.

Two residents sustained minor injuries. One was transported to the hospital for further evaluation. Firefighters also ventilated the house to clear lingering smoke.

The incident remains under investigation.