School officials say a lockdown at St. Peter's College in northern New Jersey has been lifted after no threat was found.

The school was under lockdown for several hours Wednesday afternoon following the discovery of a note threatening violence on campus.

Jersey City Mayor Jerramiah Healy said the handwritten note made no mention of bombs or guns, but did threaten violence against the school. Initial reports from fire officials said the note was an e-mailed bomb threat.

Police were notified of the threat and immediately ordered all buildings on the campus closed while they began searching each room in each building, said police Lt. Edgar Martinez.

No particular building was mentioned in the note, police said.

"We take it very seriously because of everything that has happened nationally. We want to make sure the students are safe," Martinez told WABC-TV in New York. Nothing had been found by midday, he said.

On Feb. 14, a gunman killed five students and them himself at Northern Illinois University.

Police were using K9 units to check St. Peter's campus for explosives, and students who live on campus were being brought to a nearby gym to have their bags checked, officials said. Commuter students were being sent home, according to a posting on the college's Web site.

Nancy Class, who works in the area, was waiting for her daughter on a sidewalk shortly after noon. Class said she received a call from her daughter, Carmen, a freshman at the school, shortly after 10:30 a.m.

"She said, 'Mom, I'm scared, come get me,"' Class said. "Your heart just stops when you get that call. You want to go running to make sure they're safe."

Class said her daughter told her students were notified about the threat by text messages from the school.

Carmen Class said that some students started to panic when they were told they couldn't leave the building.

"Some people started screaming," she said. "I was thinking, 'What's happening? Is this a rumor or is this real?' I felt safer after the police came."

Raisa Hernandez said her daughter Vanessa, a freshman, called her and said she was in class when students received a text message telling them to stay inside and get on the floor.

The lockdown is the second at a New Jersey college this month. Seton Hall University in South Orange was locked down Feb. 11 after a student's ex-boyfriend shot himself in the stomach.