MONROE (WWJ/AP) – Federal authorities say  electronic components from a radio-controlled vehicle were used in an explosive device attached to a lawyer’s car in Monroe last fall. The Bureau of Alcohol, Tobacco, Firearms and Explosives is doubling the reward for tips that could help them solve the case.

Agents appealed to the public Thursday for more information in the investigation.

remote control car Feds Raise Reward In Monroe Car Bombing

Parts found in the explosive device can be found in several toys, including the one pictured here. (credit: ATF)

David McCain, head of the ATF in Detroit, said the parts used in the homemade device came from remote control cars that anyone can buy at a hobby store. He said this suggests that whoever made the bomb knew the electronics and circuitry to make what the ATV considers a “sophisticated device.”

Monroe lawyer Erik Chappell and two sons, Grant and Cole were injured when a bomb attached to Volvo car exploded last September, about 35 miles southwest of Detroit.  The family was on its way to the children’s football practice.

McCain said they have a list of suspects and they’ve taken polygraph tests, but no arrests have been made.

McCain said that doesn’t mean they’re stuck.”We’re at the point that we have leads, but we would feel like we need more leads,” he said.

“If there’s someone out there that’s got this jewel of information that will put us over the top … I mean, we’re not gonna stop. We’re gonna continue to work this case and I’m sure that we’re gonna solve it,” McCain said.

The reward for information is now $20,000.

MORE: Father’s 911 Call After Monroe Car Bombing

(TM and © Copyright 2011 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2011 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed. The Associated Press contributed to this report.)

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