The humanitarian crisis in the besieged Ukrainian city of Mariupol continues as Russia refocuses on the city’s last remaining stronghold. About 100 civilians who’d sheltered inside the Azovstal steelworks managed to escape on Sunday, helped by Red Cross workers to crawl over rubble and climb out to safety. Some reported that they hadn’t seen sunlight for 2 months. But hundreds remain inside, and now Russian forces are storming the plant. Taking the port city is a key Russian aim, but the steelworks and its maze of underground tunnels – surrounded by water on 3 sides – have become a fortress for about 1,000 citizens and a small group of Ukrainian soldiers. Earlier this year, Ukraine officials gave fighters maps of the underground network and supplied the plant with 40,000 packages of food. “But we didn’t expect such a genocide and inhumane war,” plant director Enver Tskitishvili said.