Story highlights

NEW: Five people are taken to hospitals; one remains

"There was a lot of screaming," a passenger tells a CNN affiliate

The captain declares a medical emergency on United Flight 1676

There were 114 passengers and five crew members onboard

CNN  — 

Three crew members and two passengers were injured Monday when a United Airlines flight encountered severe turbulence, a spokeswoman for the airline said.

The captain declared an emergency on United Flight 1676, which was flying from Denver, Colorado, to Billings, Montana, said United’s Christen Davis. The flight met turbulence as it descended.

“Our primary focus is assisting our employees and passengers who were injured,” United spokeswoman Christen David said.

The Federal Aviation Administration said the pilot “declared a medical emergency after a flight attendant was injured by turbulence. The plane landed in Billings without incident.”

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Passenger: Turbulence felt like impact
02:30 - Source: CNN

Three flight attendants and two passengers were taken to hospitals, said Luke Punzenberger, a spokesman for the airline. All were treated and released except one flight attendant.

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Turbulence throws fliers around cabin
01:35 - Source: KTVQ
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Turbulence knocked baby from mom's arms
01:04 - Source: CNN

There were 114 passengers and five crew members onboard, including passenger Bill Dahlin.

“There was a lot of screaming, a lot of hollering,” he told CNN affiliate KTVQ.

Dahlin said one woman hit the ceiling so hard that the ceiling cracked. He said he thought the crew was just as surprised by the sudden turbulence as the passengers were.

“I think they were somewhat panicked,” KTVQ reported Dahlin said. “I think they were trying to assess things themselves so they really didn’t offer any explanation because of what happened so quickly.”

Transatlantic flights set to be bumpier

Last month, a United flight returned to Newark Liberty International Airport in New Jersey after turbulence injured five flight attendants.

The Beijing-bound United Flight 89 hit “severe turbulence” about 45 minutes into the flight, officials said.

CNN’s Ray Sanchez contributed to this report.