The incident happened at approximately 12:30 a.m. EST. My first tweets went up at 12:44. This story went live on the Sun-Times at 1:10, which is later than I would have liked.

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Three people are injured after a gunman opened fire inside Strozier library on the campus of Florida State University early Thursday morning. The suspected gunman was killed by police officers responding to the incident.

Two people are being treated at Tallahassee Memorial Hospital. One is in critical condition and one is listed as stable. The third victim’s location or condition is not known.

The suspected shooter has not been identified and his motive remains unclear.

The incident happened about 12:30 a.m. EST when police received reports of a person shot on campus. Responding officers encountered the suspected shooter and ordered him to drop his weapon. The suspected gunman opened fire on the officers, who returned fire, killing him.

A media briefing is expected at 6 a.m. EST.

John Ehab, a sophomore from Tampa, said he was on the library’s third floor when he heard multiple gunshots.

“Everyone heard them,” he said. People took cover in the book aisles to hide from the gunman in case he came onto the floor, Ehab said.

Freshman Nikolai Hernandez said he was in his dorm room across from the library when he heard five or six rapid gunshots.

“It was a consecutive bop, bop, bop, bop, bop,” Hernandez said. “It makes me definitely a little bit nervous. I was supposed to be in the library. I had a paper to do and I got a little bit lazy and decided not to do it.”

The library is generally open 24 hours a day, and alumni described the role the library plays in campus life on Twitter.

An alert was sent to students shortly after the shooting happened, though there was no indication of any kind on the university’s homepage two hours after the incident began.

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A video posted to YouTube shows a group of people inside the library as police make an announcement.

Students, reporters and other witnesses on the scene took to social media to share what they were seeing.

The Associated Press contributed to this report.