A 22-year-old man has been arrested in London, U.K., after an online threat against Wilfrid Laurier University’s Waterloo location prompted a campus lockdown Friday.

The university was locked down from 6 a.m. to 11:30 a.m. Friday after receiving a tip from the FBI about a message threatening the institution posted on the web forum site 4chan.

According to Waterloo police, detectives from the Metropolitan Police Service arrested the man in Tottenham Hale in north London “on suspicion of malicious communication.” The man is in custody but details about the arrest and potential charges are “limited,” Waterloo police said.

The man’s connection to the school, if one exists, is unknown.

Kevin Crowley, a Wilfrid Laurier University spokesman, said: “I think that knowing that there wasn’t a local threat will be a comfort to students and staff.”

He said there were few people on campus at the time of the lockdown, which lasted nearly six hours.

Waterloo police compared the threat to a warning posted before a shooting earlier this month at an Oregon college that left 10 people, including the shooter, dead.

A photo shared on Twitter showed a post that featured an image of a frog holding a gun which read: “Don’t go to laurier science building hall tomorrow. happening thread will be posted in the morning.”

A post that preceded the Oregon shooting read: “Don’t go to school if you are in the northwest. happening thread will be posted tomorrow morning.”

Waterloo police say investigators are consulting with other law enforcement agencies.

The investigation into the threat involved several agencies including the Royal Canadian Mounted Police, the National Cyber Crime Unit, the FBI and the Metropolitan Police Service.

With files from Brennan Doherty and The Canadian Press