An investigation has begun into the cause of a fire that ripped through the upper level of legendary north London music venue Koko, which had been undergoing a £40m upgrade designed by Archer Humphryes Architects.

Sixty firefighters were drafted in to tackle the blaze, which broke out at the Camden institution just before 9pm on Monday.

The club, which over the years has hosted the Rolling Stones, Motörhead, Prince and Oasis, had been undergoing a refurbishment which will also see a private members’ club, boutique hotel and recording studio added to the grade II-listed building.

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