Israel's Foreign Minister Avigdor Lieberman told a group of diplomats that "the reports of a ceasefire, are far from representing reality. I spoke with the Prime Minister, and as of now they are incorrect".
Hamas spokesperson Sami Abu Zuhri said the group "denies" any deal reached regarding an additional calm.
Moshir Al-Masri, a spokesperson for the Islamic Jihad, the second most prominent militant group in Gaza, also denied the deal.
According to a BBC report, apparently also confirmed to some other news agencies by an Israeli official, the ceasefire would come into effect at 6 AM (local time) tomorrow.
"There is an agreement for a ceasefire beginning tomorrow. I believe it is 6 in the morning (0300 GMT)," an Israeli official had reportedly said on condition of anonymity.
Israel and Hamas had agreed to a humanitarian ceasefire for five hours today at a UN request but Gaza based militants did not completely keep their promise firing three rockets on Israel which did not cause any casualty.