AZOV SPECIAL FORCES REGIMENT OF THE UKRANIAN NATIONAL GUARD VIA AP
This frame taken from an undated video provided Sunday, May 1, by the Azov Special Forces Regiment of the Ukrainian National Guard shows people climbing over debris at the Azovstal steel plant, in Mariupol, eastern Ukraine. As many as 100,000 people may still be in Mariupol, including an estimated 2,000 Ukrainian fighters beneath the sprawling, Soviet-era steel plant — the only part of the city not occupied by the Russians.