Footage of the blaze showed thick white smoke pouring from windows of the three-storey building.
A fire fighter watches an animation company which caught fire in Kyoto, July 18, 2019.
The death toll of suspected arson at a Japanese animation studio in Kyoto has jumped to at least 24 people, fire officials told AFP news agency.
The force estimated some 30 people had been injured in the fire - 10 of whom were unconscious.
Bodies were found on the second floor of the three-story building after the fire had started at around 10.30 a.m.
Several knife-like objects were found at the scene, but it's unknown if they were the suspect's according to NHK.
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The injured along with the suspect, a 41-year-old man, have been rushed to the hospital, Kyodo News quoted the police as saying.
The fire was believed to have been started deliberately, local police told AFP. Police never announced an arrest for setting the blaze, though five people were convicted of negligence.
Neighbors reported hearing explosions before seeing smoke billowing from the building.
"We are in the process of learning what happened", said a woman who answered the phone at the firm's headquarters in Uji City in the Kyoto region.
The fire department said it began receiving calls around 10:35 am (0135 GMT) about the fire at the studio belonging to Kyoto Animation.
Sentai Filmworks, a company that licenses and localizes anime such as several works by Kyoto Animation for Blu-ray releases and other products, set up a GoFundMe page to raise funds for the studio. The company also has a head office, a 2nd Studio building, a Tokyo Office, and the Animation DO building in other locations.