Eight so-called safe routes out of Ukrainian cities under attack, open today - but none of the humanitarian corridors cover Mariupol.
Resistance forces refused to surrender and lay down their arms there, rejecting an offer from Russia to allow for evacuations to take place.
A fresh attack by Moscow was aimed at an art school where around 400 people had sought shelter.
Washington Post reporter Siobhan O'Grady is in Ukraine and says the situation on the ground in Mariupol is 'dire'.
O'Grady reports that there are bodies strewn on the streets in the Ukrainian city with very little water the people there are in bad condition for mounting a defensive effort.
There is testimony of Russian atrocities on the ground in Mariupol as well as the electricity being cut off to the city.
