BATHURST, N.B. -- Police say three youths have been arrested in Bathurst, after a threat involving schools in the northern New Brunswick city was posted on social media.

The alleged threat prompted a lockdown of students at the Nepisiguit High School and Place des Jeunes School on Monday morning, but was lifted shortly before noon, and students sent home for the rest of the day.

In a post on their Facebook page, Bathurst City Police say other schools in the municipality were also placed in a "restricted access" mode during the incident.

Police have not said if the three youths were students at the schools, but do say the investigation is ongoing.

The police are thanking school staff for their professionalism during the process to secure students and their collaboration with law enforcement personnel.

They are also commending parents for their cooperation and understanding during the course of the incident.