You can only close tunnels after normalisering in/out traffic to/from Gaza. Now they are a life line. There is nothing in international law allowing to cut off a whole population from its normal requirements. They are now starting at the wrong side: first you should normalize traffic and after that the tunnels are not needed anyway.
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Russia says planned truce in Syria's Aleppo disrupted by Nusra Front attacks (Reuters)
from the article: Hamas: Egypt destroying Gaza smuggling tunnels by flooding them