Israeli media say four Palestinians arrested early Sunday do not have any connection to a heightened terror warning that put police on high alert late Saturday.

Israeli police say they believe the four detainees were workers who crossed into Israel illegally.

Police say no other suspects linked to the security alert have been arrested, and Israeli radio says the alert was lifted today.

However, Israeli authorities say the West Bank and Gaza Strip borders will remain closed during the eight-day Jewish Passover holiday, which ends May 1.