Live updates: UNLV campus shooting victims, suspect, and responses

A student who was inside the building on the University of Nevada's Las Vegas campus where the shooting took place said no one was concerned at first when they heard a noise during class.

Brett Johnsen was attending class on the second floor of the business law building when his professor stopped mid-lecture after hearing a loud noise — but he said it didn’t sound like a gunshot so the professor continued teaching.

“Then an alarm came on,” Johnsen said. “I’ve never heard an alarm like that before, it didn’t sound like a fire alarm,”

The students in the class began packing things up, relatively calmly, Johnsen said.

“When we began to walk out of the class, that’s when things got real,” he said.

The look on his professor’s face turned into panic and he urged the students to get back, lock the door and get on the ground.

A few moments later, the professor opened the door to check that it was clear and advised the students to run. Johnsen said he ran as fast as he could down the stairs of the building and outside as far as he could go.

He said everyone on campus was telling each other to run and evacuate.

“It looked like every single cop in Las Vegas was at UNLV,” Johnsen said.