The border crossing between Egypt and Gaza opened Saturday to let a trickle of desperately needed aid into the besieged Palestinian territory for the first time since Israel sealed it off and began pounding it with airstrikes following Hamas’ bloody rampage two weeks ago.

Just 20 trucks were allowed in, an amount aid workers said was insufficient to address the unprecedented humanitarian crisis. More than 200 trucks carrying 3,000 tons of aid have been waiting nearby for days.

Gaza’s 2.3 million Palestinians, half of whom have fled their homes, are rationing food and drinking dirty water. Hospitals say they are running low on medical supplies and fuel for emergency generators amid a territory-wide power blackout. Five hospitals have stopped functioning because of fuel shortages and bombing damage, the Hamas-run Health Ministry said.