An explosion at a midtown Tulsa home has investigators searching for answers.

So far, the blast is unexplained.

Officials were called to the home in the 4100 block of South Zunis Avenue about 4:30 a.m.

One man found suffering from burns, and the bathroom door was blown open.

He was transported to a local hospital.

According to the fire captain, there were no obvious signs of illicit behavior.

By daylight, arson investigators and a K9 officer were combing through the home.

Two other men were not injured and have been questioned by both police and fire investigators.

The fire and subsequent damage was contained in the bathroom.

Neighbors reported they were awakened by a blast.

Investigators were still combing the scene at 9 a.m.