The cause of the explosions is not known, but police spokesman Klaus Arboe says the building hit by the fire appear to contain powerful fireworks.

Arboe could not confirm media reports that at least one person was found dead Saturday.

A 400-yard security perimeter was created around the warehouse in Store Andst, a village near Kolding, 125 miles (200 kilometers) west of Copenhagen.

Danish media said the area around the warehouse was littered with pieces of fireworks.

In 2004, a firefighter was killed and 17 injured in a huge fire in a firework factory in the Kolding suburb of Seest.