Egypt has sent about 40 tanks and armored personnel carriers to northeastern Sinai within the past two weeks as part of a series of measures to bolster security on its border with Gaza, two Egyptian security sources said.

The deployment took place ahead of the expansion of Israeli military operations around Gaza's southern city of Rafah, where much of its population has sought safety, sharpening Egyptian fears that Palestinians could be forced en masse out of the enclave.

Israeli warplanes struck Rafah, which adjoins the border, on Friday and Prime Minister Benjamin Netanyahu ordered the military to prepare to evacuate the displaced people.