A massive fire at a guesthouse in Romania has left six people dead, including at least one child, authorities said.

Emergency intervention teams were sent to the blaze in the village of Tohani in Prahova county, where 26 people were staying at the guesthouse, according to the General Inspectorate for Emergency Situations.

Authorities said 18 people escaped the fire and two were being treated for burns.

On Tuesday authorities said the blaze had been extinguished and the search for the missing people was continuing.

The affected area was about 1,000 square metres. There was no indication what caused the blaze.

Photos of the fire shared by emergency authorities show a near hollowed-out structure engulfed in flames as firefighters work to put it out.