OSAKA — A man in a work uniform appeared to be cleaning near automated teller machines in an office building Tuesday evening about five minutes before an explosion there left one man in critical condition and three others injured, police said Wednesday.

The bank said it had assigned no one to clean the area Tuesday.

The explosion and subsequent fire occurred at around 6:45 p.m. Two ATMs operated by Asahi Bank and the surrounding area on the first floor of the nine-story Osaka Saitama Building were damaged. The building is in the busy business district of Chuo Ward.

Earlier in the day, police examined the scene in an effort to pinpoint the cause of the explosion, as well as the status of two security cameras. They also searched for more witnesses.

According to police, witnesses did not see any suspicious objects or detect any strange odors before the explosion occurred.

Investigators have not found any explosive device fragments and now suspect the explosion involved vaporized gasoline.

Police had said earlier it was not immediately known whether cash was stolen from the ATMs.

Satoshi Ueno, a 36-year-old security guard who was near the ATMs at the time of the explosion, sustained serious, full-body burns.

Ueno reportedly told paramedics while being taken to a hospital that he saw someone cleaning near the ATMs shortly before the explosion took place.

Osamu Fujita, a 32-year-old office worker who was also near the ATMs, suffered serious burns to his head and legs, according to police and firefighters. Two other men, Kiyokazu Nosaka, 36, and Junichi Adachi, 26, suffered minor injuries.

The security company responsible for the ATMs said that shortly before the blast, it received a telephone call from a man identifying himself as an employee of the firm’s main subcontractor, telling them that one of the ATMs was out of order and they should dispatch a maintenance crew. The subcontractor denied making the call.

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