YOUNGSTOWN, Ohio - The Catholic Diocese placed its schools on lockdown after being notified of a threat to schools in Youngstown.

The anonymous internet message threatened to shoot people returning to school after Christmas break.

Youngstown Police Chief Rod Foley described the threat as not credible.

Schools in Austintown and Lowellville posted extra security.

Youngstown Community School had its guard scan people and took additional measures.

"Everything is highly secure. You can see the gates, then they walk through and have to buzz in, walk through a metal detector , buzz the next door, sign in with the guard, come to the office and sign in," said Sister Mary Dunn from the Youngstown Community School.

Sister Mary tells 21 News that about 99 percent of the students remained in class. About six parents took their children home.

Chief Foley says his department is working to track down the individual who posted the threat.