McLellan said police had not immediately identified either person, but he said authorities believed this ended the threat that shuttered North Lake College. The campus had locked down and police had warned of an active shooter.

“I don’t believe we’re looking for a suspect at large,” he said in a briefing with reporters.

The public school is part of the Dallas County Community College District, which was the site of a tragedy last summer. El Centro College, another school in the district, was at epicenter of the carnage when a gunman last summer killed five police officers and wounded seven others in the deadliest single day for law enforcement since the attacks of Sept. 11, 2001. The suspect told officers he was upset about police shootings and wanted to kill white people, especially white police officers. After an hours-long standoff, he was killed by a police bomb robot.

And the lockdown came just days after a violent attack at the University of Texas at Austin, where a freshman was stabbed to death and three other students wounded.

At North Lake, live video broadcast from the school showed police officers swarming to the scene while students and others were hurried out of buildings on the campus.

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The school advised on its home page: “Proceed with others to the nearest room and barricade and/or lock yourselves in the room. Wait in place for further instructions from police. If you are not on campus, STAY AWAY for your own safety. We’ll update you as soon as we can.”

A math tutor told the Associated Press that she saw a man in the hallway approach a woman and shoot her three times.

Officials at the college and the district could not immediately be reached for comment.

DART, the Dallas transit line, announced, “Due to police activity at North Lake College, Orange Line trains are not serving North Lake College Station.”

Hamzah Fahzy, a 17-year-old student at the school, said an alarm went on and police ordered people into a back room of the library. He said that many police were on campus and that he could hear helicopters overhead. He shared a video he took from the scene: