CHARLESTON, W.Va. -- Officials with the John Amos power plant have doubled the reward to $100,000 for information about the people responsible for a string of bomb threats against the Putnam County facility.

"It's just to make it more of an incentive. [The reward] is a combined effort with AEP, the onsite contractors and the Building Construction Trades," said Joe Haynes, the plant's community-relations manager.

Plant officials had been offering a $50,000 reward for information about the threats.

"They're frustrated with what's going on here and they just want to put an end to it," Haynes said.

American Electric Power's John Amos plant has received five threats within the last four weeks, with the most recent on Monday.

The plant also received threats on Oct. 23, 24, 28 and 30.

The Putnam County Sheriff's Department, the State Police and the FBI are involved in the investigation.

The threats were found written on the walls of bathrooms within the plant, and one threat was called into a contractor's phone, Haynes said.

A bomb threat is defined as a "threat of terrorist acts," which is a felony offense under state law and is also a federal offense. Under state law, a person found guilty can be fined from $5,000 to $25,000 and sentenced to one to three years in jail.

CHARLESTON, W.Va. -- Officials with the John Amos power plant have doubled the reward to $100,000 for information about the people responsible for a string of bomb threats against the Putnam County facility.

"It's just to make it more of an incentive. [The reward] is a combined effort with AEP, the onsite contractors and the Building Construction Trades," said Joe Haynes, the plant's community-relations manager.

Plant officials had been offering a $50,000 reward for information about the threats.

"They're frustrated with what's going on here and they just want to put an end to it," Haynes said.

American Electric Power's John Amos plant has received five threats within the last four weeks, with the most recent on Monday.

The plant also received threats on Oct. 23, 24, 28 and 30.

The Putnam County Sheriff's Department, the State Police and the FBI are involved in the investigation.

The threats were found written on the walls of bathrooms within the plant, and one threat was called into a contractor's phone, Haynes said.

A bomb threat is defined as a "threat of terrorist acts," which is a felony offense under state law and is also a federal offense. Under state law, a person found guilty can be fined from $5,000 to $25,000 and sentenced to one to three years in jail.