The Harlingen Fire Department is investigating after a fire left three families without a home Monday afternoon. 

Officials say the fire broke out in a four-unit duplex building located at 2106 North Commerce Street in Harlingen after 2 p.m.

Upon arriving, firefighters noticed fire and smoke coming from the first unit of the duplex. 

Fire officials say the blaze was under control in about 30 minutes, and no one was injured. 

The American Red Cross is assisting the families impacted by the fire. 

The cause of the fire remains under investigation.