London, UK (CNN) A huge blaze tore through one of London's top hotels Wednesday, just days after it announced the completion of a multimillion-dollar renovation project.

More than 100 firefighters were sent to tackle the fire at the five-star Mandarin Oriental hotel, in the exclusive Knightsbridge district of the UK capital.

It was six hours before the blaze was brought under control, the London Fire Brigade said. Thirty-six hotel guests and 250 hotel staff were evacuated, it said.

The hotel group said it believed that everyone in the building at the time of the fire had been accounted for. The London Ambulance Service said Wednesday night that multiple crews had been sent to the scene but no one had required treatment.

First reports of the blaze emerged just before 4 p.m. Plumes of thick, black smoke were seen billowing into the air above Hyde Park as the fire took hold. Traffic in the area -- home to luxury stores Harvey Nichols and Harrods -- was brought to a standstill.

The fire in London is the mandarin oriental hotel in Knightsbridge pic.twitter.com/tMrVTOUF3j — Jack (@jackwmartin_) June 6, 2018

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