Norwich ― Police are investigating an early morning stabbing Thursday that left a 20-year-old man in critical condition.

Police have not identified the victim but said he arrived at Backus Hospital for treatment of a stab wound to the chest and was flown by Life Star helicopter to Hartford Hospital for surgery.

Police, in a statement, said they responded to a 911 call at 1:34 a.m. for a report of a disturbance in the parking lot of 229 Boswell Ave. where someone yelled they were stabbed. Police arrived and found what appeared to be blood in the parking lot but no victim.

Police said the stabbing victim showed up later at Backus Hospital.

Police said there is no public safety concern at this time since the stabbing does not appear to be a random act.

Police continue to search for a suspect. Anyone with information is asked to contact Norwich Police Detective Callender at (860) 886-5561, Ext. 3154, or email scallender@cityofnorwich.com. The department’s anonymous tip line is (860) 886-5561, Ext. 4.