Several huge explosion were heard on Sunday at a US army base in Japan.

According to reports, 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."

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.

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."

Detail later