Maine State Police say a letter believed to contain "non-toxic powder" was mailed to Gov. John Baldacci's office Tuesday.

It was intercepted by his office staff, according to a release sent out this morning. The Associated Press reported that letters containing white power were sent to seven other governors' offices, all with Dallas postmarks. The letter to Baldacci's office was also mailed from Texas, according to the state police release.

Col. Patrick Fleming said Baldacci's executive protection unit had alerted the staff to watch for the letter, based off the fact that similar letters had showed up at other governors' offices.

Fleming said Baldacci's staff followed protocol for receiving mail and as a result the letter was not opened and no one was exposed to the powder. The letter was taken to the state health lab to be analyzed.

According to the AP, government operations were disrupted Monday when workers in Alabama, Michigan, Minnesota, Mississippi, Missouri, Montana and Rhode Island opened the letters and discovered white powder.

Tests showed the powder wasn't dangerous.

FBI spokesman Rich Kolko in Washington said the Dallas FBI office is investigating and warned other states to be on the lookout for similar letters, the AP reported.

The FBI declined to say if the letters were specifically addressed to each governor or written to a generic "governor's office" address.

Alabama's public safety director, Christopher Murphy, said the letter received in Montgomery did not specifically target Gov. Bob Riley but declined to elaborate on what it said.

"That is a point of relief," Murphy said.

The letters forced the evacuation of the Capitol in Helena, Mont., and the closing of a major street in downtown Montgomery for several hours. Hundreds of law enforcement and public safety employees were involved between the seven states.

"Just because it's a hoax, doesn't mean it's not a crime," Kolko said.