Accounts of the incident differ. Some say a ricin-laced pellet was either fired or injected from an umbrella tip as Markov waited at the bus stop, on his way to the headquarters of the BBC’s World Service.
Other accounts suggest the assailant used a syringe to inject the poison into Mr Markov’s leg as he bent down to pick up an umbrella he had been carrying.
Well, the first option is certainly the more interesting. Wikipedia sounds more definitive.