Tensions in the region were still high on Monday morning, with schools cancelled for students in southern Israel for security concerns.

Israeli Prime Minister Benjamin Netanyahu cut short his trip to Paris and returned overnight, according to a statement from his office.

At a news conference in Paris on Sunday, Netanyahu defended his decision to move toward an unofficial cease-fire with Hamas.

He also warned that if calm along the border will not be kept, Israel "will act with maximum power."

The sudden burst of violence potentially shattered hopes for a long-term agreement between Israel and Hamas, as Egyptian and the UN officials have been working to broker a cease-fire deal in exchange for Israeli easing its 12-year crippling blockade on Gaza.

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