SCHWENKSVILLE, Pa. (WPVI) — Two sons of a Montgomery County sheriff’s deputy were killed in a house fire on Wednesday morning.

The fire erupted around 5:30 a.m. at a home in the 900 block of Summit Avenue in Schwenksville, Pa.

Authorities say 11-year-old Bryan Lukens Jr. and 4-year-old Parker Lukens were found dead inside the home once the flames were extinguished.

Dep. Bryan Lukens was being treated at the burn unit at Lehigh Valley Hospital. His wife, Tracy, and 9-year-old daughter Soffia were treated for their injuries Pottstown Hospital and released, the sheriff’s department said.

The blaze was placed under control shortly after fire crews arrived, police say.

Fire marshals are working to determine a cause of the fire.