"Pained beyond words by the extremely tragic fire accident at a building in Kolkata. My deep sympathy and condolences for the bereaved families. I wish for speedy recovery of the injured," Kovind tweeted.

At least seven people were killed in an inferno in a multi-storeyed building in Kolkata, which houses zonal offices of Eastern Railway and South Eastern Railway on Monday, West Bengal Chief Minister Mamata Banerjee said.

Two more persons were also feared dead, Banerjee, who has visited the spot, said.

Railway Minister Piyush Goyal has set up a high-level committee to ascertain the cause of the fire.