BANGKOK -- A fire seriously damaged the top floor of the Myanmar embassy in neighboring Thailand on Monday but there were no injuries, Thai fire department and police officials said.

They said the fire, which occurred after sunrise, was brought under control within 30 minutes but that there was a significant amount of smoke.

An investigation is under way at the embassy, which is on a main thoroughfare in the Thai capital Bangkok.

"The blaze broke out on the top floor, in a room full of documents and filing cabinets," said firefighter Niwat Jootawong. "That floor is basically burnt down. There's also a little damage on the ground floor."

The fire occurred one day after an international conference on cyclone relief in Myanmar, where the junta has drawn worldwide criticism over its handling of the disaster that has left at least 133,000 dead or missing.