HOUSTON (AP) — Five passengers and two flight attendants have been hurt after a flight from Tampa, Fla., to Houston hit severe turbulence over Louisiana.Houston Airport Systems spokeswoman Darian Ward says the United Airlines flight landed safely in Houston early Wednesday. She says at least three people were transported to a hospital but has no information on their conditions.United Airlines spokesman Michael Trevino says seven were hurt, but he did not have information about their injuries. The pilots declared an emergency so they would be given priority upon landing in Houston. United is run by Chicago-based United Continental Holdings Inc.Ward says the flight hit turbulence over Lake Charles, La. It was not clear whether the turbulence was caused by the same storm system that spawned tornadoes near Dallas on Tuesday.