PHILADELPHIA (CBS) – Philadelphia fire officials are investigating the cause of a blaze that broke out inside a row home early Friday morning.

The fire started at about 3:45 a.m. inside a home in the 3100 block of N. 7th Street near Allegheny Avenue in North Philadelphia.

According to fire officials, three residents were treated at the scene for minor injuries.

The cause of the fire remains under police investigation.

Reported By Steve Beck, CBSPhilly.com