The fire department was called shortly after the fire began and quickly arrived to the area.
Chemistry Department will need at least two days to identify the remains of 23 individuals involved in a fire at the tahfiz school in Jalan Keramat. They said the bodies were found piled on each other. suggesting they died trying to flee the fire.
Mohd Daniel Borhan, a 15-year-old student who survived the fire, said he woke up during the night but saw the main door area was already having fire.
The room in which the fire started, measuring 20ft by 40ft, was said by a fire brigade spokesman, quoted by the New Straits Times, to have been littered with charred bodies.More news: Dozens die in twin attacks in Iraq
Seven people, who got injured in the fire, were rushed to a nearby hospital while 11 others were rescued, Al Jazeera reported. "We are now investigating the cause of the fire", Drahman added. Police have said no foul play was suspected.
Minister Tengku Adnan said the school had been operating without a licence, while local media reported that officials had recently raised fire safety concerns about such private schools.
The latest tragedy was "the effect of the absence of enforcement, and the failure to abide by rules and regulations by the operators of the religious school", said Mr Chandra Muzaffar, a political scientist who promotes Islamic reform.
He said the school's original architectural plan included an open top floor that allowed access to two exit staircases.More news: Philippe Coutinho trains with Liverpool ahead of Champions League opener
The official who confirmed the deaths of the 25 students and teachers, thinks it is one of Malaysia's worst fire disasters in the last 20 years. His tweet read: "Innalillah".
Deputy Prime Minister Ahmad Zahid Hamidi told reporters that it isn't the first such incident, adding that all Islamic religious schools were required to register and follow safety requirements. It is one of the worst fires involving so many lives.
"Before 6 o'clock, the firemen came but I think numerous people already died inside because of the smoke", Ahmad said. The school is located in a three-storey building in the central Kuala Lumpur.More news: Hillary Says She's 'Done With Being a Candidate'