In 2009, three Londoners, Tanvir Hussain, Assad Sarwar and Ahmed Abdullah Ali, were convicted of conspiring to detonate bombs disguised as soft drinks on seven airplanes bound for Canada and the US The MI5 investigation regarding the plot involved more than a year of surveillance work conducted by over two hundred officers. British and US officials said the plot – unlike many similar homegrown European Islamic militant plots – was directly linked to al-Qaeda and guided by senior al-Qaeda members in Pakistan.