Delta Air Lines says a flight from Salt Lake City to Amsterdam was hit by serious turbulence, sending 25 people to hospitals and forcing the flight to divert to Minneapolis-St. Paul International Airport.

The flight, which was taking 275 passengers from Salt Lake City to Amsterdam, made an emergency landing in Minneapolis on Wednesday evening, the airline said.

Some passengers were terrified, convinced the plane was going down. One seasoned traveler said it was the roughest flight he’d ever taken. A woman on board felt like she was experiencing an earthquake.