CONCORD, N.H. - State officials received a letter Wednesday from someone who threatened to set off a bomb during First Night celebrations, state police said.

The letter was sent to Gov. Jeanne Shaheen's office and intercepted by state police Wednesday morning.

Police believe the letter was sent by the person dubbed "The Concord Bomber" who placed two bombs in the city last year, because the handwriting on the envelope was similar.

The letter did not specify which community would be targeted on New Year's Eve, state police said. State police have contacted all the communities holding celebrations Friday night, but were leaving it up to them to decide what to do.

Official "First Night" celebrations were planned in Concord, Portsmouth, Conway and Wolfeboro. Other community New Year's Eve and millennium celebrations were planned in Nashua, Keene, Salem, Dover, Rochester, Milton and Somersworth.

State police had set up a hotline to receive tips: The number was 888-222-0267.

"In the interim, we ask that citizens exercise an appropriate amount of caution and report any suspicious act to the state police," state police said in a statement.

Deb Hanson, a co-chairwoman of First Night Portsmouth, said the group learned of the threat shortly after 3 p.m. She said the director was talking with local law enforcement and would have no immediate comment.

Heidi Edwards Dunn, executive director of First Night New Hampshire, the Concord celebration, said that as of Wednesday afternoon, the celebration would go forward as planned.

She said the group had asked local police for extra security, and "we're trusting that they know what they're doing."

"At this point we are going ahead with it," she said. Police "have not told us not to."

No one was injured by the two bombs left in Concord last year, but one started a small fire on a bookshelf in the Concord Library; the other was left on the state library steps, but did not detonate.

The same person was suspected of sending a letter threatening to bomb a mall. That letter went to the governor's office, but the threat never materialized.