LONDON, England — Britain today witnessed the worst snowstorm in 18 years which forced the cancellation of more than 650 flights at London’s Heathrow airport on Monday and shut down the city’s tube & bus network, partially paralyzing the British capital.

London City airport is also closed, while the British capital’s other two airports, Stansted and Gatwick, were operating with severe delays.

Bus services were suspended throughout London last night on the grounds of passenger safety due to the unsafe road conditions resulting in a large number of traffic incidents across London.