JERUSALEM, Jan 18 (Reuters) - Israel on Friday closed its border crossing into the Hamas-run Gaza Strip in response to cross-border rocket fire, and the lead U.N. aid agency said even humanitarian supplies were not being allowed into the territory.

The United Nations Relief and Works Agency (UNRWA), which provides food to Palestinian refugees in Gaza, said it was not allowed to deliver truckloads of humanitarian supplies on Friday morning as it usually does.

"Gaza is completely shut down. This will only add to an already dire situation," said UNRWA spokesman Christopher Gunness.

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