MIDTOWN, Manhattan (WABC) -- Falling debris injured three stagehands, one critically, inside a theater in Midtown Manhattan on Thursday morning.Emergency crews responded to the scene outside the Golden Theatre on 45th Street just after 11 a.m.The stagehands were working on a catwalk in the rear of the theater when the accident happened.They were taken to area hospitals.One victim was in critical condition, while the other two suffered moderate injuries.----------