The suspect, who arrived on a bus in Butt, Mont, on Wednesday, detained hostages after a 10-hour break with the police, according to reports.
It is believed that the suspect is armed with explosives and firearms. The reports indicated that some shots were fired, but no hostage was injured. Butte police said the chemical agents were fired on the bus to force the suspect. None of the officers was hurt.
The scene appeared at about midday when a lone suspect boarded Jefferson Lines and ordered the gun to arrive at the Butte Courthouse. The bus was on the way to Billings from Missoula.
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The Great Falls Tribune reported that the shooter allowed everyone except one to leave the bus. The last hostage left the bus at. after negotiations with the authorities.
The nearby Butte Civic Center was evacuated, and the surrounding streets were blocked while reporting the suspect, Missoula KTMF-TV.
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After the evening at Butte Police, the SWAT unit still pointed out that their weapons were pointing at a bus car park near the city center. Sheriff Ed Lester said the suspect had a handgun and had an explosive.