PHOENIX -- Crews were called to the scene of some kind of explosion at a North Valley home Thursday morning.

Water heater was electric

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It happened at about 6 a.m. in the area of 38th Street and Thunderbird Road.

No injuries were reported, but video from NewsChopper 3 showed debris scattered all over and even on the roof of the home next door. A could portion of the garage wall was blown away. The force even blew through a cinder block wall and ripped a hole in the wall of the neighboring house.

While it's not officially confirmed what caused the explosion, video from NewsChopper 3 showed a water heater on the corner near a school yard a couple of blocks away from the house.

According to Phoenix Fire Dispatch, crews were called out for a reported fire. They said when they arrived on the scene there were no flames, but plenty of damage.

A hazardous material crew was on the scene and Southwest Gas crews were called.

There reportedly was one person in the home at the time of the explosion. The Phoenix Fire Department said that man told them there was no gas connected to water heater. Southwest Gas confirmed that and said there is no gas to the house, which means the explosion was not gas related.

A plumber told 3TV it's possible that too much pressure built up in the water heater and the pressure-relief valve wasn't working properly.

ATF crews and bomb squad investigators are also on the scene to try and determine exactly what happened. A firefighter on the scene, who said he'd never seen anything like this, told 3TV that having those personnel on site is procedure when there's such a large explosion.

People reportedly felt the explosion as much as a mile away.