NEOSHO, Mo. — A gunman opened fire in the sanctuary of a southwest Missouri church today, killing three people and wounding several others, authorities said.

About 25 to 50 people were briefly held hostage at the First Congregational Church until the gunman surrendered, a Neosho spokeswoman, Desiree Bridges, said.

About four or five people were wounded, Police Chief Dave McCracken said, but several others who were injured fled the scene.

The shooter was being held at the Newton County Jail, but police were not releasing any information about him. Bridges said he was related to someone in the church, but declined to elaborate. No charges had been filed today, Mr. McCracken said.

The gunman had two small-caliber handguns and one 9 mm semiautomatic machine pistol with a large magazine, Mr. McCracken said. The shooting followed the 1 p.m. service, which is held in Spanish. About 50 people, ranging in age from children to the elderly, were in the church at the time.

The gunman surrendered to authorities after about 10 minutes of negotiation.

“At the time that the rescue attempt was successful we had approximately 20 people in the sanctuary still,” he said. “We had some people who escaped the crime scene prior to the police arrival that were wounded, and we had some people escape during the process and at the time of the rescue.”

He said no one was injured during the arrest.

Mr. McCracken said he could not confirm whether the gunman was a member of the church. But he said an incident involving the suspect and a family that attended the First Congregational Church last night fueled the shooting today.

“At this point though, we don’t have any information more than that,” Mr. McCracken said.

The identities of the deceased were being withheld, Mr. McCracken said.