Six people are dead and more than a dozen more are injured after a passenger train in Denmark was reportedly struck by falling cargo from a passing freight train.

The Associated Press reports that the train traveling from Odense to Copenhagen was struck by debris from a freight train hauling cargo for the brewery company Carlsberg, which confirmed that a train carrying its cargo was involved. As many as 16 people received light to moderate injuries, according to police.

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"We do not know precisely what caused the accident,” though falling debris from the freight train was a possibility, a police spokesman said Wednesday, according to the AP.

Photos of the incident showed damage to the freight train as well, including to a large tarp that the AP reports was possibly part of the debris which struck the passenger train.

“Ordinary Danes on their way to work or heading home from the Christmas holidays have had their lives smashed,” Danish Prime Minister Lars Loekke Rasmussen said in a statement, according to the AP.

One passenger on the train told a local news station that the train “was out on the bridge when there was a huge ‘bang,' " the AP reports. "Very quickly thereafter, the train braked."

"We still do not know exactly what happened," Funen chief of police Lars Bræmhøj said Wednesday, according to CNN. "There was a freight train with goods that came off the wagon, and a passenger train then hit it. How it happened we cannot say. What we do now is run an investigation, which is very thorough, and therefore it will take time before we can say exactly what happened."

Passengers on the train added to CNN that the accident occurred shortly after travelers boarded in Nyborg.

"We had just got on the train in Nyborg, and it felt like we barely made it out before we heard a giant crash, and then all the windows where we were sitting exploded. They exploded in towards us, and we all fell to the floor," passenger Heidi Langberg Zumbusch told CNN.

"We were very scared, and also, it was only 7:30 [a.m.] so it was pitch black and dark still. We had no idea how far out over the water we were," she added.