PRINCETON, N.J. (CBS) – The campus of Princeton University was evacuated Tuesday morning after university officials say a bomb threat was called in to the campus.

According to a message posted on the school’s website at 10:26 a.m., a bomb threat was made to multiple unspecified campus buildings.

A statement from the Princeton Police Department stated that in the interest of public safety, the bomb threat is being handled as credible.

“It was an unspecified threat to multiple buildings on campus,” said Princeton University spokesperson Martin Mbugua.

The message on the school’s website urged all those on campus and those in university offices to immediately evacuate the campus.

The message said to not to return to campus for any reason until advised otherwise.

It was not immediately known which buildings were mentioned.

“I think at that point we are still trying to grasp what was happening,” said student Harrison Lee.

The Princeton Police Department is assisting the Princeton Univ. Dept. of Public Safety in the investigation.

The official Princeton University Twitter page tweeted out the following information:

If you’ve left campus, you may go to Nassau Inn, Princeton Public Library and Princeton Arts Council building downtown.

“I have work here over 23 years,” said employee Arthur Miller.  “I was a student here in the seventies. I remember buildings being evacuated when you would get threats, because that happens, but I have never seen anything like this, in all of those years.”

Bomb sniffing dogs were brought in as federal, state, local investigators went through the school top to bottom.

As of 5 p.m., officials had searched the campus but found nothing. All roadways were also reopened.

According to Princeton University’s website, the school reopened its campus at 6:25 p.m., about eight hours after students, faculty and staff were evacuated.

The bomb threats remains under investigation.

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