FBI, sheriff asking for help in finding Osage bomber

The device was found by church employees who were cleaning the church, used as a polling place, following run-off elections, held there the previous day.

The Bentonville Police Bomb Squad responded to the location at the request of the Carroll County Sheriff's Department and rendered the IED safe. This explosive device had been constructed in a 12-ounce Pepsi-Cola can.

The FBI and the Carroll County Sheriff's Office are investigating this case and seeking new information.

"The construction of the device in this case was very sophisticated," said Coleman. "We believe whoever is responsible for this act had a message to send to the community and to law enforcement."

He said it is possible innocent people connected with the perpetrator could be in danger.

"Explosives by their nature are sensitive materials, and there is a risk that this subject's materials could be found by a family member, child, co-worker, or acquaintance who could be severely injured."

He added the subject is likely a local who is known to area residents.

Although not revealing everything they know, the Bureau is asking for help in locating the subject, who might possess these traits: skilled in electronics and possesses above-average knowledge of circuitry, skilled working with small projects and models, skills which may have come from previous technical training, employment, or hobbies such as pyrotechnics.

"He may be known as someone who can repair electrical problems. He may have used these skills to play pranks on others in the past. In fact, some of these pranks may have been motivated by revenge. He may display the attitude of, 'I don't get mad; I get even.' Additionally, he may have committed acts of vandalism with pyrotechnic/explosive devices."

He may have a private area where he can work undisturbed and may have circuit boards, batteries, wires, ammunition, pyrotechnic powder and fuses, electronic switches, springs, glue/adhesives, and tools necessary for his craft to include wire cutters, tweezers, and a Dremel tool.

Neighbors may have heard explosions or gunfire sounds due to experiments.

"We are asking if anyone has any information that might be related to this matter to contact us via any of the following means: Carroll County Sheriff's Office at (870) 423-2901 or the FBI's Little Rock Office at (501) 221-9100," Coleman said. "Regardless of how insignificant you think your information might be, or whether or not you think we already are aware of it, please let us assess the relevance of your tip. Also, please do not discount someone you may suspect if he does not fit all the traits and characteristics listed above. We remind the public of the reward of $20,000 for information leading to the arrest and indictment of the person responsible for this incident."