This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

O’FALLON, MO – On Tuesday afternoon, O’Fallon, MO, police were called by a woman who had left a home after a domestic dispute at the Mark Twain Mobile Home Court, off I-70 near Bryan Road. She was unharmed.

Officers responded to the scene and saw a man with a weapon who went back into the home. Police have called in additional police units to help, including the St. Charles County Regional SWAT Team.

After several hours the St. Charles County SWAT Team made entry into a trailer setting off some sort concussion device prior to entry, according to Fox 2/News 11 crew on the scene.

A statement from the O’Fallon Missouri Police Department says officers who enter the trailer failed to locate 31-year-old Branden Johnson, a Troy, MO resident who is wanted for domestic assault and unlawful use of a weapon in St. Charles County. Johnson is thought to be armed and dangerous.

If you have seen or know of Branden Johnson’s whereabouts, please call the O’Fallon Police Department at 636-240-3200.

The St. Charles County Regional SWAT Team is currently assisting O'Fallon PD with an incident involving an armed subject in a trailer in the Mark Twain Trailer Park off Veterans Memorial Parkway. Please avoid the area. More info at https://t.co/i3vLbtwEzv pic.twitter.com/ej7vCf5E2G — SCCMOPD (@SCCMOPD) February 26, 2019

38.802132 -90.723166