It was not the first time some of them had barricaded themselves in a room at school.

The sight of law enforcement officers in tactical gear, sweeping campus for a gunman, was familiar.

So was the fear for several students who sheltered in place during Thursday’s deadly shooting at Florida State University and shared a traumatizing coincidence: They had endured the Parkland, Fla., school massacre in 2018.

Joshua Gallagher, a law student at Florida State who went to Marjory Stoneman Douglas High School in Parkland, wrote on social media on Thursday that he never thought that gun violence would hit close to home again.

“Then I’m in the FSU Law Library,” where he heard an alarm: “active shooter on campus,” Mr. Gallagher wrote on X. “No matter your politics, we need to meet — and something has to change.”

Ilana Badiner, 21, who is graduating from Florida State in two weeks, said in an interview that she huddled in the student union basement with about 30 people during the shooting. In 2018, she was a student at a school adjacent to Marjory Stoneman Douglas High School. She said her school had been placed on lockdown for four hours.

“It was the same situation today, where people were just on the phones calling everybody and there were people crying,” she said. “It’s terrible that this keeps happening.”

Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.

Thank you for your patience while we verify access.

Already a subscriber? Log in.

Want all of The Times? Subscribe.