SAN ANTONIO -

A fire tore through a vacant home early Saturday morning causing significant damage.

It happened a little after 1 a.m. in the 400 block of Hillcrest Drive.

A neighbor told fire crews they heard dogs barking then saw a glow in the back of the home.

Arson investigators are working to determine a cause but believe the blaze might have been intentionally set.

The extent of the damage is unknown.

No one was injured.