Firefighters extinguished a three-alarm fire Monday at an apartment building in New Rochelle on Monday.

The fire started around 1:30 p.m. in the six-story building at 90 Union St.

Fire officials say an estimated 40 to 50 residents were impacted, but everyone is believed to have escaped safely. Residents were forced to go outside in frigid temperatures around 19 degrees.

The Red Cross and local partners opened a Reception Center at the Fuller Center on Main Street in New Rochelle where residents could gather, eat and register with the Red Cross. For those needing a place to sleep, the Red Cross opened a shelter at the Monroe College Athletic Center, located at 19 Lecount Place. It says it will continue to work with residents in the days to come to provide additional services and support, including casework, emotional support and health assistance.

New Rochelle Fire Chief Andrew Sandor says the fire was hard to extinguish because there's a space above the top floor that goes across the entire building.

Firefighters say the fire was electrical and started in a woman's apartment, but they are still investigating the exact cause.