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A huge explosion has rocked the centre of the Hungarian capital Budapest sparking fears of a terror attack.

At least two people are believed to have been injured with a large police presence at the city's Oktogon intersection.

Reports say the blast may have been caused by a gas leak, but this has not officially been confirmed.

Footage from the scene shows a queue of police cars rushing down the street with terrified people running in the other direction.

Cops have cordoned off a large area around a shop at the corner of Kiraly Utca (King Street) and buildings have been evacuated.

(Image: @Eire_QC/Twitter) (Image: @Eire_QC/Twitter) (Image: @ofirzarfatinews/Twitter)

A Brit at the scene Owain Brown told the Mirror he could see at least five bodies lying on the floor "motionless".

"Hopefully they were in shock or something," he said.

"There is no building damage or cars outside damaged. Just glass from apartment block. I'm Staying 200m from it."

A queue of up to 30 police cars and other security vehicles were photographed streaming through the streets.

Footage posted online showed fragments of broken blast strewn on street across the centre. There are no reports of fire.

The explosion reportedly took place in one of the buildings of King Street and Teresa Boulevard standing at the crossroads on the ground floor.

Those injured were rushed to the hospital in ambulances.

Firefighters reportedly examined the building where the blast took place and are working to secure the site.

Countries across Europe are on a high state of alert over possible terror threats following militant attacks in Germany, France and Belgium over the past few months.

Hungary's prime minister Viktor Orban has been a fierce opponent of Germany's policy of allowing tens of Syrian refugees into the EU.

It is unclear whether the Hungarian authorities have received any credible threats in recent days.

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