Fire has swept through a psychiatry clinic in the Japanese city of Osaka, with 27 people feared dead and police investigating possible arson after media reported a man had spilt a liquid that fuelled the blaze.
The fire broke out on the fourth floor of an office building in a busy district of the western city at around 10am on Friday, public broadcaster NHK said.
"Most of the people who lost their lives could be medical workers or patients at the clinic. This is unbearable," said Yumiko Inoue, a doctor from a nearby hospital told Reuters, as she looked up at the building's charred windows from across the street.
A man who looked to be in his 50s or 60s was seen carrying a bag filled with liquid into the building, where he put it down near a heater and knocked it over, spilling the liquid and starting the fire, Kyodo News reported.
Other media said the man was believed to be a patient of the clinic, and that he carried a bag leaking liquid into the reception area before the fire started.
Twenty-four people were confirmed dead, NHK said. An official at Osaka city's fire department earlier told Reuters that 27 people had suffered from cardiopulmonary arrest, the term used in Japan before a death is officially confirmed.
The fire was largely extinguished within 30 minutes, according to NHK, after engulfing a narrow, 20-square metre room in the clinic. Footage showed smoke pouring out of the windows of the building's fourth floor and roof.
Located in a shopping and entertainment district not far from Osaka's main train station, the building also houses a beauty salon, a clothing shop and an English-language school, NHK said.
"When I looked outside I saw orange flames in the fourth-floor window of the building. A woman was waving her hands for help from the sixth floor window," a 36-year-old woman who works in an office nearby told Kyodo News.
Prime Minister Fumio Kishida offered condolences and said authorities were working to determine the cause.
The father of a doctor who ran the clinic was unable to reach him by mobile phone, he told the Yomiuri newspaper.
"Around noon I heard there was news of a fire on television and was surprised. My wife went to the site but we still don't know what's going on. I can't get through to my son's phone," he said.
The clinic's website was not accessible but an internet archive from earlier this year showed it treated patients for issues from depression and panic to sleep apnoea and anaemia.
An arson attack at an animation studio in the city of Kyoto in 2019 killed more than 30 people and injured dozens.
Australian Associated Press