ISTANBUL The Rafah border crossing on the Egypt-Gaza border officially resumed operations on Monday, with 50 people expected to leave Gaza and 50 others set to return, according to Egyptian official media. Al-Qahera News reported on Monday that an initial group of Palestinians had arrived at the crossing. The Palestinian side of the Rafah crossing began operating on a trial basis on Sunday after being completely closed for more than 18 months because of Israeli restrictions. About 50