On 21 July, 2005, four attempted bomb attacks disrupted part of London's public transport system two weeks after the 7 July 2005 London bombings. The explosions occurred around midday at Shepherd's Bush, Warren Street and Oval stations on London Underground, and on a bus in Shoreditch. A fifth bomber dumped his device without attempting to set it off.
Connecting lines and stations were closed and evacuated. Metropolitan Police later said the intention was to cause large-scale loss of life, but only the detonators of the bombs exploded, probably causing the popping sounds reported by witnesses, and only one minor injury was reported. The suspects fled the scenes after their bombs failed to explode.
On Friday 22 July CCTV images of four suspects wanted in connection with the bombings were released . Two of the men shown in these images were identified by police on Monday 25 July as Muktar Said Ibrahim and Yasin Hassan Omar. A manhunt, described by the Metropolitan police commissioner Sir Ian Blair as "the largest ever investigation that the Met has ever mounted" was started.
By 29 July police had arrested all four of the main bombing suspects from the 21 July attempted bombings. Yasin Hassan Omar was arrested by police on 27 July, in Birmingham. On 29 July, two more suspects were arrested in London. A fourth suspect, Osman Hussein, was arrested in Rome, Italy and later extradited to the UK. According to these reports, all four known suspected bombers have now been arrested, although police are still looking for other possible gang members. Police also arrested numerous other people in the course of their investigations.
On 9 July 2007 three defendants, Muktar Said Ibrahim, 29, Yassin Omar, 26, and Ramzi Mohammed, 25, were found guilty of conspiracy to murder. The 4 attempted bombers were each sentenced to jail for a minimum of 40 years .
