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Several huge explosions were heard today at a US army base in Japan.

At least 10 fire engines rushed to the scene in Sagamihara city, south of Tokyo, amid reports of a blast sparked by an unknown cause.

Footage shows several small bangs and one huge explosion, which witnesses described on social media as like "a fireworks display."

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Pentagon spokesman US Navy Commander Bill Urban confirmed there are no injuries.

The site is part of a US army complex next to the capital where three deliberate explosions were reported in April, in what police suspect was an act of left-wing Japanese extremists.

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But so far there has been nothing to suggest this blast was terror-related.

Commander Urban said: "There are no reports of injury, and base firefighters and first responders are currently fighting the resulting fire to prevent its spread to nearby buildings."

Japanese terrorist expert Michael Penn, who heads up Tokyo-based news agency Shingetsu News, said the blast occurred just after midnight Japan time at a building at the Sagami Depot.

He told the Mirror: "These explosions happened at a single warehouse. The explosions then continued quite intensely.

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"At least 10 fire engines were called to the scene and it seems like military guards called them.

"It is a deserted area and the question is how the fire was started. Something obviously blew it up."

Social media users have been sharing dramatic photos and videos from the region.

The Sagamihara Fire Department told Fox News: "Fire from the American military base has occurred."

The Sagami General Depot houses storage for petroleum products and ammunition, Japanese broadcasters are reporting.

Mr Penn said it is likely US military guards at the scene called Japanese firefighters but "restrictions were put on them".

He said "water was not used to douse the fire", perhaps because it was a chemical explosion.

He added that the warehouse contains oxide cylinders.

The fire department said the blasts occurred shortly before 1.00am local time and more than ten fire trucks were dispatched.

Japan’s Asahi newspaper reported that nobody has been evacuated but Mr Penn said it is a "deserted area".

The official cause of the explosion remains unknown but Japanese news agency Shingetsu said there had been an "accidental fire".