House Foreign Affairs Committee Chairman Michael McCaul The House of Representatives' Foreign Affairs Committee Chairman, Michael McCaul, told reporters that Egypt allegedly gave Israel a warning three days before the Hamas raid.
Michael McCaul, chairman of the House Foreign Affairs Committee, told reporters, "We know that Egypt warned the Israelis three days before (the attack) that something like this could happen."
Israeli Prime Minister Binyamin Netanyahu dismissed the claim as "completely false".
Israel's intelligence services have come under scrutiny for their failure to prevent the deadliest attacks in the country's history.
Commenting on the allegation, which Tel Aviv denied, US Congressman McCaul said he did not want to "get too deep into classified matters, but a warning was issued."
McCaul added that "the question is what level of warning was given."
The alleged warning to Israel was made by an Egyptian intelligence official who spoke to the Associated Press.
He said Israel had been warned that "something big is being planned" in Gaza.
The Egyptian official, who spoke on condition of anonymity, also claimed that "Israel underestimated their warning."
The Financial Times quoted two intelligence officials as saying that there was no concrete intelligence that an attack of this nature was imminent.
Gaza attackReuters
The attack on Gaza on October 11
On Wednesday, Netanyahu called the claim of a concrete warning "completely fake news".
Egypt, which shares the Rafah border crossing with Gaza, often acts as a mediator between Israel and Hamas.
In Saturday's attack, more than 1,500 Hamas militants attacked simultaneously from the air, land and sea.
At least 1,200 people, including soldiers and civilians, were killed in Hamas attacks. More than 1000 people have been killed in Israeli airstrikes in Gaza.