Providence police are searching for a group of youths who showed up uninvited to a kindergarten graduation party and shot one of the guests. Police said 16-year-old Ny’asia Lawrence was shot in the back Sunday and is being treated at Hasbro Children’s Hospital. Police said the incident started when Lawrence’s mother told an uninvited guest at her nephew’s kindergarten graduation party to leave or pay for the food he was eating. They said the youth left, but came back to the home on Public Street with a group of friends, one of whom had a gun and began shooting. Lawrence was the only one injured. Police have not made any arrests.