A man refused to come out of his Buford home when officers returned with warrants Tuesday, police said. Authorities also said he threatened in a text message to family that he would “kill police officers.”

Stephen Morgan, 29, had a knife and threatened family members Monday, March 19, on Tuggle Road, police said.

“He brandished the knife in the officers’ presence, but was not close enough to threaten them directly,” Gwinnett County Police Sgt. Jake Smith wrote in a news release. “Family members advised that Morgan was schizophrenic, and officers witnessed him acting erratically.”

The family and the officers left the house. Police returned the next day after getting warrants for simple assault and terroristic threats and acts.

“Morgan was acting erratically and would not come out,” Smith wrote, adding that police confirmed all other family members were not in the house. “Family members advised that Morgan still had the knife and that there was a firearm inside the residence.”

A partial SWAT team responded around 10 a.m. Tuesday, when Morgan stayed inside the house and “sent threatening text messages to his family,” police said.

“Among those texts was a message threatening to kill police officers,” Smith wrote. “A full SWAT callout was initiated at 11:45 a.m.”

SWAT officers fired gas rounds into the house around 3 p.m.

“Morgan began speaking with negotiators at that point, and said he wished to surrender.  He came out and was taken into custody without further incident at 3:30 p.m.,” Smith wrote.

Morgan was taken to the Gwinnett County Sheriff’s Office Detention Center. He was charged with simple assault, terroristic threats and acts and obstruction of a law enforcement officer.