Providence police are investigating an early Monday stabbing after finding a man with a wound to his abdomen near Friendship and Richmond streets at about 2:45 a.m., authorities said. The man told officers he had been stabbed in a stairwell outside the Kulture club, police said. Officers were unable to locate a crime scene. Police also reported a disturbance inside the club involving fights. They said they found evidence of pepper spray and blood. No information was provided about the man’s identity or condition, or whether anyone had been arrested.