Egypt closed on Tuesday the Rafah border crossing with Palestine's Gaza Strip, after opening it for three days to allow humanitarian cases to cross in both directions, Palestinian Ma'an news agency reported. The Rafah border crossing between Gaza and Sinai is the only passage for 1.8 million Palestinians residing in Gaza, who have been living under Israeli siege since 2006, to enter and exit the strip. The crossing has been mostly closed by Egyptian authorities since October 2014 on security grounds. Cairo periodically opens the border for short periods to allow civilians with foreign passports, Palestinian students, and those with medical needs to travel back and forth.