A lone gunman opened fire on the main campus of the University of Nevada, Las Vegas (UNLV) on Wednesday, killing three people and wounding a fourth before the suspect was shot dead by police, authorities said at a news conference.

Here’s what you should know about the shooting, the victims and the suspect.

What happened on the University of Nevada Las Vegas campus?

• At around 11:45 a.m. local time (19:45 GMT) on Wednesday, a gunman opened fire on the fourth floor of the building that houses UNLV’s Lee Business School, where students were preparing for final exams next week.
• The university tweeted at around 11:59 a.m. (19:59 GMT) that police were responding to reports of shots fired on campus and warned students to “RUN-HIDE-FIGHT”.
• Authorities gave the all-clear about 40 minutes after the first report of an active shooter.

UPDSouth-UNLV
UPD Alert – UNLV
University Police respond to confirmed active shooter at BEH. This is not a test. RUN HIDE FIGHT. https://t.co/qhKQ6oXNVZ

– UNLV (@unlv) December 6, 2023

How many people were killed in the Las Vegas shooting?

The suspect killed three people and wounded a fourth before being shot by police, authorities said at a news conference a few hours later.

The attack was the worst shooting in the city since October 2017, when a gunman killed 60 people and injured more than 400 after firing from the window of a room at the Mandalay Bay Casino on the world-famous Las Vegas Strip, just a few miles away The UNLV campus opened.

What about the other witnesses?

The surviving gunshot victim was in stable condition, according to Sheriff Kevin McMahill of the Las Vegas Metropolitan Police Department.

He said several other people suffered panic attacks during the fracas and a number of officers were treated for minor injuries sustained while searching the sprawling campus for additional victims or suspects. None were found.

Who is the shooter and was he caught?

The shooter was a professor who had unsuccessfully sought employment at the school, a law enforcement official with direct knowledge of the investigation told The Associated Press.

He previously worked at East Carolina University in North Carolina, said the official, who spoke on condition of anonymity because he was not authorized to release the information publicly.

According to Las Vegas Metro Sheriff Kevin McMahill, authorities will not publicly identify this person until family members have been notified.

Where did the shooting take place?

McMahill said the shooting began on the fourth floor of Beam Hall, a building that houses the university’s business school, then moved to other floors before finally ending outside, where the suspect was “neutralized.”

There are approximately 25,000 undergraduate and 8,000 graduate and postgraduate students enrolled at the university.

Is UNLV safe now?

According to the school’s website, there is no longer an active threat on campus.

However, classes at the university have been canceled through Sunday, UNLV President Keith Whitfield said Wednesday post.

“Today is a tragic day for UNLV,” he wrote. “We are all still in shock as we process the incredible event.”

There have been 80 school shootings in the U.S. this year, according to a CNN analysis.

In a press release, U.S. President Joe Biden said the U.S. “has experienced more than 600 mass shootings and approximately 40,000 deaths from gun violence.”

URGENT: From Sheriff Kevin McMahill: “No further threat to the community. The suspect is deceased. At the moment we know there are three victims, but the extent of the injuries is unknown. This number could change. We will let you know when we know more.” https://t.co/Y3jT9VcNFz

– LVMPD (@LVMPD) December 6, 2023

What are people saying?

President Joe Biden expressed his condolences to the families affected by the shooting in Las Vegas and another shooting in Texas that killed at least six people on Wednesday.

He also called on Republicans in Congress to work with Democrats to pass a ban on assault weapons and high-capacity magazines.

“Together, we must do more to prevent more families and more communities like Austin, San Antonio and Las Vegas from being torn apart by gun violence,” Biden said.

Las Vegas Mayor Carolyn G. Goodman said the shooting was “tragic.”

Tragic and heartbreaking news is coming out @unlv. We are praying for everyone on campus as law enforcement responds to the situation. 🙏

– Carolyn G. Goodman (@mayoroflasvegas) December 6, 2023

UNLV professor Kevaney Martin said it was frightening.

“I can’t even begin to explain it,” Martin said. “I tried to hold it together and not cry for my students, but I never want to experience those emotions again.”

Selena Guevara said she received a call from her daughter Markie Montoya, who was in class in the building and heard “gunshots, screams and screams” but was not injured.

“She’s hysterical, telling me ‘I love you’ and so scared,” Guevara said.

Another student, Jordan Eckermann, 25, said he was in his business law class in a second-floor classroom when he heard a loud bang and a piercing alarm went off, bringing students to their feet. Some ran out of the room in panic, others followed their professor’s instructions to stay calm, Eckermann said.

He walked out and looked into the eyes of a police officer in a bulletproof vest with a long gun. Clothes, backpacks and water bottles lay scattered on the floor.

Eckerman said he mouthed to the officer, “Where do you want me to go?” The officer pointed to an exit.

Minutes later, while he was outside, Eckermann said he heard gunshots, at least 20 shots in total. The air smelled of gunpowder. He said he kept walking away from campus even though he didn’t know where to go.