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Up to thirty people have been injured in an explosion at a Jewish celebration in London that may have been sparked by a mobile phone.

A crowd of hundreds had gathered in Stamford Hill to observe Lag BaOmer, a festive day on which bonfires are a common tradition.

Footage of the incident showed a bonfire about to be lit with the sound of singing in the background as many people were stood within a few metres.

Suddenly, a huge fireball erupted over the entire crowd.

People panicked and ran screaming from the scene, witnesses said.

London Ambulance Service and the Jewish volunteer ambulance service Hatzola attended and treated "multiple patients" for burn injuries.

(Image: Twitter/@Hatzola) (Image: Twitter/@Hatzola) (Image: Twitter/@Hatzola)

The Jewish news website Yeshiva World said around thirty people were treated and ten taken to hospital.

The severity of the injuries is currently not known.

The cause of the explosion also remains unclear although several witnesses claimed a mobile phone had been thrown onto the bonfire.

(Image: Twitter/@Hatzola) (Image: Twitter/@Hatzola) (Image: Twitter/@Hatzola)

According to Yeshiva, the Rebbe - the name given to leaders of the Chassidic Jewish movement - had made a speech about the "dangers" of smartphones and said he would be burning one.

"It appears that the explosion was caused by fuel and not the smartphone, although there definitely were multiple smartphones placed inside the pile to be burned," Yeshiva reports.