A Michigan man and his two sons were seriously injured by a car bomb late Tuesday, but all three are expected to survive.

Police are investigating whether the attack -- which occurred on a street in Monroe, Mich., about 35 miles southwest of Detroit -- was random or targeted at one of the victims.

The Detroit Free Press identified the father as Eric Chappell, a lawyer living in La Salle, Mich. He was less seriously injured than his sons and was helping investigators on Wednesday.

The victims are very fortunate, very blessed, to be alive, Donald Dawkins, a spokesman for the Bureau of Alcohol, Tobacco, Firearms and Explosives, told USA Today. There was a lot of power behind it.

One witness, Shawn Remington, told USA Today that he went to the scene after hearing a loud sound and seeing smoke. By the time I got there, there was nothing left of the vehicle, he said. It was down to bare metal.

I was looking to see if there were deer and saw the car come around and go boom, another witness, Edwin Holly, told the Detroit Free Press. Things like that don't happen unless you're in James Bond or something, you know? I mean, that car just blew up.

Dawkins said the ATF had some theories about the attack, but that is all they are now, Reuters reported.

Investigators are offering a $10,000 reward for information on the bomber.

Car bombs are improvised explosive devices that can be activated in several ways, including by opening the car door or starting the engine. They're especially common weapons in parts of the Middle East. In May 2010, there was a scare in New York City when a car bomb was discovered in Times Square, but it misfired and didn't hurt anyone.

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