Police are investigating after a man walked into a Pittsburgh hospital overnight with a gunshot wound.Police covering Zone 2 came to the hospital after the gunshot victim arrived by private means just after 6 a.m., according to Pittsburgh Public Safety. The 30-year-old man did not provide information to officers about where the incident occurred. He arrived at the hospital in stable condition, Public Safety said.It is unclear which hospital the man arrived at. Zone 2 covers several Pittsburgh neighborhoods, including Downtown, the Hill District, the Strip District, and Lawrenceville.Police continue to investigate.