"Any reconciliation between the (Fatah-dominated Palestinian Authority) and Hamas must include a commitment to international agreements and to the conditions of the Quartet, first of which is recognising Israel and demilitarising Hamas," the official said in the Israeli government's first reaction to the deal signed in Cairo.
The official was referring to the diplomatic Quartet on Middle East peace, which includes the United Nations, the United States, the European Union and Russia.
The publicly-released parts of the agreement did not specify what would happen to Hamas' armed wing.
Hamas does not recognise Israel and has fought three wars with the Jewish state since 2008.
"As long as Hamas remains armed and as long as it calls for the destruction of Israel, Israel will consider Hamas responsible for any terror attack originating from Gaza," the official said.
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