Fire officials investigating cause of South Bend vacant house fire

SOUTH BEND, Ind. -- Fire investigators are looking into what sparked an overnight fire in South Bend.

Police cruisers, emergency cars and fire trucks all lined South Jackson Street just after midnight. A vacant house that firefighters say was not locked caught fire.

Police say no one was found inside.

"We had to be real careful because we had to pull some of the siding off and it's right by the wire so we had to use extra caution,” said Battalion Chief David Maenhout. 

There was no power routed to the house, so investigators are looking into all possible causes at this point.