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An explosion has rocked an office for migration in Germany after a suitcase packed with aerosols was detonated, it is reported.

The blast occurred close to the reception area of the building in Zirndorf, near Nuremberg, this afternoon, according to local media.

Terrified witnesses reported hearing a 'loud bang', before discovering the burning remnants of the suitcase lying in an allotment garden.

It is currently unclear whether there are any injuries, or deaths.

(Image: Sky News) (Image: Sky News)

The explosion went off after someone detonated the luggage, which was filed with 'numerous' aerosol cans, the broadcaster Bayerischer Rundfunk reports.

It happened in the 'immediate vicinity' of the office for migrants and refugees.

Witnesses later reported hearing an enormous bang as the cans blew up, according to the broadcaster, which cited police sources.

Photos of the scene show what appears to be the destroyed suitcase lying on the ground, while officials in hi-vis jackets investigate.

Further details of the blast, including who was responsible for it, remain unclear at this time.

(Image: Google)

It comes just days after a Syrian asylum seeker blew himself up in the southern German town of Ansbach.

The bomber was influenced by an unknown person in a chat conversation on his

mobile phone, Bavaria's Interior Minister Joachim Herrmann said today.

"It's possible to deduce that another person wherever they were at the time of the call, of the chat, significantly influenced how the attacker acted," Herrmann said on the sidelines of a meeting of the Bavarian cabinet.

"The chat ended directly before the attack," he added.

(Image: Getty)

The 27-year-old Syrian, who had arrived in Germany two years ago, set off explosives in his rucksack on Sunday outside a musical festival in Ansbach, a town of 40,000 people southwest

of Nuremberg, killing himself and injuring 15 people.

Police are trying to find out whether the attacker had help making the bomb and whether it exploded prematurely, which could suggest he wanted to kill as many people as possible.

"There are indications that the attacker did not want to ignite the bomb at this moment," a spokesman for the Bavarian Interior Ministry said.

This story is developing.