BRENTWOOD - Officials say an explosion that leveled a vacant Brentwood home this morning was apparently caused by a gas leak.

Neighbors say the explosion could be felt for miles away. Those living near the home say they were knocked off their feet by the blast.

Fire officials say 21 people suffered minor injuries as a result of the explosion and were transported to local hospitals for evaluation. No one was inside the home when it exploded and it was under renovation, according to authorities.

The exact cause of the explosion remains under investigation.

Chopper 12 footage from the Brentwood home explosion