A 21-year-old man has been gunned down in Worcester.The murder, at 11:00 on Sunday, was gang-related, police said.Video of the shooting shows an armed man chasing another man wearing a red top through a block of flats. The shooter fires several times and the victim falls to the ground in front of a flat on the ground floor. Children and adults run from their flats. Some people run to the victim, who is lying in a pool of blood.Police could not confirm if any arrests had been made.