One man was arrested Monday evening after allegedly attacking his mother and refusing to leave a home south of Laramie for over six hours after deputies arrived.

It took tear gas to get him to surrender.

Undersheriff Josh DeBree says the man's mother left the house after she was assaulted around 11:30 a.m. Monday. She reported the attack and received medical treatment before deputies went out to the house to get in touch with the son.

DeBree says the mother is in good condition.

Deputies got to the house and tried to contact the son by knocking at the front door, making phone calls and loudspeaker announcements -- all of which proved fruitless.

At that point, the special response team was sent to the scene. Power and gas were cut off to the area shortly thereafter.

DeBree says law enforcement never had any information that the man was armed, but officers have to be ready for anything, hence the rifles and protective gear.

"We do have a little background with the suspect in the matter," DeBree said, adding that the man was "potentially violent."

Officers continued using the loudspeaker throughout the day, asking the man to come out and give himself up. They never received a response.

That is, until about 6 p.m., when tear gas canisters were fired into the house.

DeBree says after that, officers heard the man coughing and they again asked him to come out. This time he obliged, and evidently gave himself up peacefully.

Charges against the man are still being investigated, DeBree said Monday.

Between the Wyoming Highway Patrol, Albany County Sheriff's Office, Laramie Police Department, special response team, DeBree estimates roughly 25 officers were on hand.

An engine from the Laramie Fire Department showed up around 6:15 p.m.

Fort Sanders was completely blocked off because of the law enforcement presence.

Two ambulances ere stationed nearby throughout the standoff. All law enforcement and first responders were noted as wearing protective vests, and some law enforcement officers had rifles.

Earlier during the day, Steve Morgan, public safety answering point administrator, said providing information about the nature of the incident would put first responders in harm's way.

Albany County School District One were not allowed to bus students into the area out of safety concerns.

Stuart Nelson, district safety director, said the district attempted to inform all parents, but only had about five minutes notice before buses ran Monday afternoon.

"The special response team is used for situations and calls that are beyond the scope of patrol officers and deputies," Lt. Gwen Smith of the Laramie Police Department said over the phone Monday afternoon.

The team responds to "any type of call that might require special munitions such as gas, or a call that would require a negotiator," Smith added. "High-risk types of calls."

Deborah Cobb and Seneca Riggins contributed to this report.

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