Specialist doctors have arrived in Romania from overseas to help treat those injured in the fire in a Bucharest nightclub that killed at least 30 people.

A handful of specialists have arrived from Israel and France to help treat the 140 people who were taken to hospital after the fire at Colectiv on Friday night, emergency situations official Raed Arafat said.

Of those, 90 are in a critical or serious condition.

Mr Arafat said that even if burns patients initially survive their injuries, medical problems can continue long afterwards as "they tend to evolve in a stable manner and then start collapsing".

He said some cases need frequent operations and their wounds need to be cared for.

The government says it will cover patients' medical costs.