July 31 (Reuters) - The National Transportation Safety

Board said it is investigating a Delta Air Lines ( DAL ) flight

that took off on Wednesday from Salt Lake City, Utah, to

Amsterdam that injured 25 people and was diverted to Minneapolis

due to severe turbulence.

On Thursday, Delta said seven crew members on the Airbus

A330-900 who were taken to hospitals have been released and all

passengers taken to hospitals for evaluation who were willing to

disclose their status to the airline have been released.

Delta said it is cooperating with the NTSB

investigation.

Delta Flight 56 was diverted to Minneapolis-Saint Paul

Airport after experiencing "significant turbulence," over

Wyoming, Delta said.

The plane was carrying 275 passengers and 13 crew. Delta

said medical personnel evaluated everyone on board after the jet

had landed safely in Minneapolis.

The aircraft encountered turbulence shortly after reaching

37,000 feet (11,277.6 m), briefly climbing to about 38,000 feet

before descending to just below 35,800 feet. It later stabilized

at an altitude of 37,000 feet, according to flight-tracking

service FlightRadar24.

Delta is operating an unscheduled flight from Minneapolis to

Amsterdam Thursday evening to transport impacted customers.