Militant in Islamic State video believed to be British 'bouncy castle' salesman

A masked man points a weapon as he speaks in this still image from a handout video obtained on January 4, 2016 from a social media website which has not been independently verified. REUTERS/Social Media via Reuters

LONDON (Reuters) - The masked militant in an Islamic State video showing the killing of five men accused by the group of being Western spies is believed to be a Londoner known as Sid who once sold inflatable bouncy castles.

Siddhartha Dhar, who left Britain for Syria while on police bail after his arrest on suspicion of belonging to a banned group and encouraging terrorism, has been identified by media as the spokesman in the militant organisation's latest film.