Firefighters are investigating a late-night blaze at a home in Yonkers.Investigators say the fire started around 11 p.m. Sunday at a home on Lefferts Road.According to investigators, the fire started in the home's basement and took about 20 minutes to contain. Authorities say a father and son were home at the time of the blaze. Both were able to make it out safely.Investigators say five firefighters received minor injuries due to slipping on ice while battling the fire.Firefighters say they do not yet know what caused the fire.