Two British terrorism suspects have died in a US drone strike in northwest Pakistan, their family and friends believe.Ibrahim Adam and Mohammed Azmir were thought to have been killed by a CIA missile in Waziristan, a region which borders Afghanistan.A close friend of Azmir\'s family, who did not want to be named, was quoted as telling PA:\"They have taken it very badly - this is the second son who has been killed in a drone strike.\"Father-of-three Azmir was born in Sheffield and lived in Ilford, Essex.The 37-year-old was made subject to a Treasury order freezing his assets in February 2010 in response to concerns he was involved in funding terrorism.However, he is not currently on the Treasury\'s list of people and organisations subject to financial sanctions.It is believed that Azmir\'s brother, Abdul Jabbar was killed by a drone in Pakistan in September last year.Adam, from Barkingside, east London, had been on the run from the UK authorities since absconding from a control order in May 2007. The 24-year-old was made subject to a control order after being stopped en route to Syria from where, the British authorities claimed, he was planning to travel to Iraq orAfghanistan for militant training or to fight Western forces.His brother, Anthony Garcia, was jailed for life in April 2007 for his part in a plot to attack targets in London and across the UK with fertiliser bombs.The Foreign and Commonwealth Office said it could not confirm Adam and Azmir\'s deaths but was investigating the reports.\"It is a remote area and getting detail might take some time,\" an FCO spokesman told Sky News.It is not clear when the two men were believed to have died, but PA reported a source as saying it was at least three months ago.