A suicidal man's nearly seven-hour standoff with Mount Pleasant police ended without injury early Thursday morning when a SWAT team launched tear gas into his bedroom.

The man, 18, had armed himself with a knife in his room above the garage at his parents' Parsonage Woods Lane home, according to the Mount Pleasant Police Department. The site is in the Park West development's Arlington subdivision off Bessemer Road and S.C. Highway 41.

Officers were called just before 9 p.m. Wednesday, and they quickly got the man's parents out of his bedroom, they said.

The parents told the police that two shotguns were in the home, but that no ammunition was inside, according to an incident report.

For 40 minutes, an officer tried to coax the man outside through a voice amplifier, but he refused, the report stated. He came through the front door at one point, only to go back inside.

The bedroom lights were turned on and off, the report stated, and the man said he wanted to go to bed instead of talk.

The SWAT team and crisis negotiators showed up, and neighboring homes were evacuated.

At 3:35 a.m. Thursday, the SWAT members shot the tear gas into the room and took the man into custody without a struggle, the report stated. He was taken to Medical University Hospital.

Reach Andrew Knapp at 937-5414 or twitter.com/offlede.