The Israeli military has warned it could take action against “terrorist targets” inside the Gaza Strip.
Brig Gen Ronen Manelis told journalists that Hamas – the militant group that controls Gaza – was using Palestinian protests as a cover for launching attacks on Israel.
Palestinian leader Mahmoud Abbas has said Israel bears “full responsibility” for bloodshed on Friday.
Sixteen Palestinians were killed by Israeli soldiers at the Gaza border.
It was the single deadliest day in the Israel-Palestine conflict since the 2014 Gaza war. The UN Security Council condemned the violence after an emergency session.