Palestine Press Agency reports that an Egyptian army helicopter flew at low altitude over Khan Younis and Rafah in Gaza at 2:30 this morning.
It hovered over the Gaza neighborhoods for nearly an hour, before it returned to Egyptian territory.
It appears that this was in conjunction with an operation to destroy tunnels under the border between Egypt and Gaza.
A security source said the helicopter was said to have come from the eastern region of the border with Egypt and entered Rafah where it flew for about half an hour, before it went to Khan Younis, without being approached by Israeli aircraft.
Ma'an seems to be the one that broke the story, and it is being picked up by many Palestinian and Egyptian Arabic media.
UPDATE: Times of Israel confirms it but says it was inadvertant and only for a few minutes.
