FARGO (AP) - An all-night standoff in the center of downtown Fargo ended at the start of Monday morning rush hour when two men surrendered and a third was arrested, police said. They reported finding an assault rifle and at least 200 rounds of ammunition in a fifth-floor apartment where the men allegedly holed up.

"A lot of people had to spend the night away from their homes. A lot of people were inconvenienced who tried to drive through downtown," Police Sgt. Jeff Skuza said. "We're glad we were able to open the streets before the whole world came to work."

Police Lt. Greg Lemke said the standoff started at about 11:30 p.m. Sunday, after a report that someone was throwing glass or ceramic from an apartment window and damaging cars below. One pickup was dented, Skuza said.

When police approached the Gardner Building apartment, they heard men talking about having high-powered rifles and saying it would take a SWAT team to get them out.

"We heard plans about how to get out of the apartment and shoot," Skuza said.

People in the building were evacuated and an area of about four square blocks was sealed off, Skuza said. Students with classes North Dakota State University's downtown campus were advised to stay away.

SWAT team members spent the night talking through the door to try to negotiate with those inside, Skuza said.

"The officers are persistent," he said. After the first two surrendered at about 6:30 a.m., "that was really the beginning of the end," he said.

Skuza said 21-year-old Zachary Steffens was arrested after officers fired a small "flash-bang" distraction grenade and entered the apartment. "He didn't resist," Skuza said.

Steffens was wanted for allegedly shining a laser into a police officer's eyes and injuring the officer in an August incident during a loud party investigation, Skuza said. He listed the apartment as his address.

The two others who surrendered a half hour before the arrest were released after questioning, Skuza said.

"We have to sort out who's responsible for what," he said.

Residents of the area were allowed to return by 8 a.m.

"About the only thing it didn't disrupt is the north-south traffic through downtown," Skuza said. "Most of the traffic does move south - that was fortunate."