Thirty residents of a La Mesa apartment complex were displaced after a fire sparked in their building Monday evening, a fire official said.

Crews were dispatched just before 7:40 p.m. to the Spring Hill Apartments, on Spring Street northeast of state Route 125, Heartland Fire & Rescue spokesperson Andy McKellar said.

There was a fire in a top floor apartment. Crews had it out by shortly after 8 p.m., he said.

The sprinkler system did activate, “helping to keep the fire in check,” McKellar said.

McKellar said firefighters contained the fire to one unit, but an additional 15 apartments were affected by water from the sprinkler system.

He said the Red Cross was called in to assist residents who needed help.