All schools in the North Shore School District were briefly put into lockout mode Monday as police investigated a possible threat.

The lockout has since been lifted. All after-school activities were being held as scheduled.

News 12 was told that there was no credible threat. Further information has not been released.

It comes amid a spate of threats at Long Island schools, including one at Valley Stream South High School Monday, and another at Farmingdale High School on Friday.