US President Joe Biden has threatened Israel with further restrictions on the supply of military equipment were Israel to carry out a major military offensive in the southern Gaza city of Rafah.

"I made it clear that if they (Israel) go into Rafah... I'm not supplying the weapons that have been used historically to deal with Rafah, to deal with the cities – that deal with that problem," Biden told broadcaster CNN in an interview, stressing "they haven't gone in Rafah yet".