aid agencies intensified their warnings on Tuesday about the toll on civilians and hospitals, which are running critically low on medical supplies.
The Houthis, acknowledging their alliance with Iran but denying acting on its orders, have been able to extend their offensive despite intensifying airstrikes by Saudi warplanes across Yemen.
physicians had treated more than 500 people in the last two weeks in Aden, including burn victims from explosions at an ammunition depot and passengers on a bus that had apparently come under shelling.
unable to reinforce its surgical teams or bring in supplies
not been able to negotiate the safe arrival of the aircraft.
Battle in Yemen has left many displaced and in need of goods and healthcare. The blockade has made it difficult for humanitarian organizations to deliver aid to Yemen.