Egyptian security officials say they have now sealed off 120 tunnels in the Sinai peninsula, which were being used to smuggle people and goods to and from neighbouring Gaza.
Several homes sitting on top of passageway exits have also been demolished.
The military has stepped up its offensive in Sinai with extra troops and tanks, after suspected militants killed 16 Egyptian border guards earlier this month.
Egypt says the gunmen used the smuggling tunnels to carry out the attack.
Lawlessness has spread in Sinai since the fall of president Hosni Mubarak and the election of Mohamed Mursi, who has vowed to restore stability to the area.
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