Medics in the besieged Black Sea port of Mariupol were racing to save lives on Thursday as the city comes under continued Russian bombardment. Amid the flashes of constant shelling, paramedics rushed from one house to the next in the search for those needing treatment. Injured were transported to a nearby maternity ward that has been converted into a hospital. One old woman shook violently in the ambulance, still in shock from an explosion.