MISSOULA, Mont. -

Montana bomb squads are on alert Friday, after threats aimed at theaters showing "The Expendables 2" were called in to the headquarters of a national movie theater chain.

Police say two different calls, from two different area codes, warned of bombs at Carmike Cinemas locations around the country. Bomb dogs searched some, but no bombs have been found.

Police aren't talking about a possible link between the threats and an arrest made last night when a 23-year-old man tried to pack a loaded pistol into a theater in Columbus, Georgia, the same city as Carmike's headquarters. Officers found more ammunition in his car.

It's been just four weeks since a gunman killed 12 and wounded 58 in a Colorado theater.

NBC Montana went to Missoula's Carmike theaters to see the precautions workers are taking. We learned police in Butte and Missoula helped theater workers check for anything suspicious.

Missoula police say a local Carmike manager called about 8:30 this morning. Bomb technicians and police swept both Missoula's Carmike theaters, the Carmike 12 on Mullan Road and the Village 6 at South Reserve.

They detected no bombs, no problems.

Police say they take these threats seriously, but they say if you want to go to the movies, go ahead.

"Very few bomb threats are ever followed through by an actual device of any kind. It's very, very rare. If someone wanted to actually cause damage to a place, they wouldn't have phoned in the threat, they'd just do whatever damage they were intending to do," said Missoula Police Sergeant Ed Gydas.

The movie, "The Expendables 2," is showing tonight at the Carmike 12 in Missoula.