A trail of flames is seen on video from underneath a Frontier Airlines flight as it lands on a Las Vegas runway in an incident under investigation by federal officials.

Flight 1326 from San Diego made a hard landing at Harry Reid International Airport on Oct. 5 after “the pilots detected smoke and declared an emergency,” Frontier said in a statement to NBC News.

Cellphone video showed fire and black smoke coming from under the Airbus 321 plane. Investigators say the flight crew made a hard emergency landing after reporting smoke in the cockpit, according to the Federal Aviation Administration.

Passengers Lucas Shook and Alondra Soto told TODAY NBC News correspondent Maggie Vespa on Monday that they felt severe turbulence as the plane dipped like a roller coaster several times as it approached the runway. When they saw smoke outside their windows upon landing, they said all four of the plane’s tires had burned out.

“It’s like you’re just sitting in a chair and you fall five feet down and you can feel it,” Shook said. “Both of our backs are a little sore.”

“And we landed, and it was so hard,” he continued. “I felt it through my body, and she felt it too.”

“I was very scared,” Soto said.

Radio traffic shows that the crew fell silent while approaching the runway.

“Red Dog 40, we have no communication with the pilot,” air traffic controllers can be heard saying. “His radios are off. We have no communication with the pilot.’

Passengers and crew were evacuated by firefighters using air stairs after the plane landed safely. They were then taken to the terminal by bus. No injuries were reported, airline and airport officials said.

The FAA and the National Transportation Safety Board are investigating the cause of the incident.

“This is a very serious situation,” NBC News aviation analyst Jeff Guzzetti, a former FAA accident investigator, told TODAY on Oct. 7.

“This crew had a very serious emergency where smoke in the cockpit impaired their ability to communicate with air traffic control.”

Soto and Shook told Vespa that Frontier offered them a $200 voucher to use within three months, which left them frustrated.

However, Frontier told NBC News that all customers were additionally given a refund for their flight.