CHICAGO (Reuters) - A policy that only ambulances rescue patients was changed on Monday after hospital workers failed to help a 15-year-old boy as he lay bleeding only steps from a Chicago hospital. Frustrated police officers who were waiting for an ambulance finally carried the wounded boy, Christopher Sercye, into Ravenswood Hospital after waiting precious minutes on Saturday night, but he died a short time later. Witnesses at the scene said hospital emergency workers refused to come to Sercye's aid despite pleas, quoting hospital rules. Ravenswood Hospital President John Blair defended the workers at a Monday news conference, but later said the policy that prevented caregivers setting foot outside the hospital to offer help would be changed. Three suspected gang members were arrested and charged in the shooting, which occurred while Sercye was playing basketball in the alley behind the hospital with friends.