Fire in a building in New York City, 12 dead.

This case will mark one of the most victims of fire in several years”, Blasio told reporters on the scene of tragedy.

This is the biggest fire tragedy we've seen in the city, in at least a quarter century”, he said.

The fire started on the first floor and was distributed very quickly until the third floor, officials said.

The cause of the fire has not yet been revealed.

We may still have casualties”, the major said.

Victims have been ages between one and more than 50 years, de Blasio has declared.