Fatah fighters stormed a Hamas-affiliated university in the Gaza Strip.
The Palestinian president said he had recommended previously the sealing or destruction of the tunnels by flooding them and then punishing the owners of the homes that contained entrances to the tunnels, including demolishing their homes.
One of the biggest issues has been building materials.
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The movement has clashed with Hamas on a number of occasions.
It has been placed under an Israeli and US-led international economic and political boycott from that time onwards.