A house explodes in Burton Saturday afternoon.

Fire crews are still trying to determine what caused the home to blow up.

They say the gas was on in the vacant building at Saginaw and Buder.

Witnesses say after hearing the blast they didn't know what to think.

Ashley Huntley of Grand Blanc says, "I just heard like this big blast, and it sounded like someone hit my friend's house."

"We just saw a little bit of fire come up in the sky. It shook the whole building," says John Solano of Flint.

No injuries are reported.