Two trains collided in Denmark early Thursday morning, leaving five people critically injured and prompting a massive emergency response north of Copenhagen.

Police described the incident as a major accident, though details about the cause of the collision remain unclear. The crash occurred at a level crossing in an area north of the Danish capital.

Emergency services responded to the scene with what authorities characterized as a massive deployment of personnel and equipment. The extent of the emergency response suggests the severity of the incident, though the total number of people aboard the trains has not been disclosed.

Five individuals were reported to be in critical condition following the head-on collision. Additional details about other potential injuries or the total number of people affected have not yet been released by authorities.

The incident represents a significant railway accident for Denmark, a country with generally strong rail safety records. Investigations into the cause of the collision are expected to follow standard protocols for such incidents.