JERICHO - The Jericho School District was on lockdown again today. Jericho High School and Middle School got more threatening messages last night. School officials had heightened security again this morning.

The schools have been locked down since the weekend.

There was also a scare at Our Lady of Mercy Academy in Syosset yesterday for the same reason. Officials believe they know who is behind the threats, but so far, no arrests have been made.

Jericho schools on alert after bomb threat2 Jericho schools put on high alert after bomb threat