US President Donald Trump has declared World War 3 "will not happen" as he signs his Gaza peace deal amongst world leaders.

Speaking at the peace summit in Egypt, Mr Trump said: "This is something that's taken off like a rocket ship, and it did from the beginning. And I've heard for years this is the biggest deal, long before I ran for office, that the Middle East, it's the biggest, most complicated deal.

"And also, it's the place that could lead to tremendous problems like World War 3. They always talk about World War 3 would start in the Middle East, and that's not going to happen. We don't want it to start anywhere, actually, but it's not going to happen."