Police have reportedly arrested two of the three suspects behind the failed attack on the British capital’s transport system.It is thought the pair were picked up at the same address in the Notting Hill area in west London. They are believed to have been involved in the Hackney bus and Oval tube stations incidents. Scotland Yard has described the development as “highly significant”. Another two people have been arrested after an operation at Liverpool Street station in east London. A fourth man believed to be linked to the attacks was seized on Wednesday. Last week’s attacks came exactly two weeks after suspected Islamist suicide bombers killed more than fifty people in a series of explosions on buses and underground trains in London. The attacks sparked the biggest manhunt ever undertaken by British police. They have been under pressure to exercise caution after they shot dead a Brazilian man last Friday whom they mistook for a suicide bomber.