The fourth suspect in the failed bombings against London last week has been arrested in Rome according to the Italian government. The three others have all reportedly been arrested in England: two of them in raids in London today, a third in the central city of Birmingham on Wednesday. All four were suspects in a series of failed attacks in London on 21st July, when explosives failed to detonate at various locations on public transport across the capital. They had all managed to escape the scenes at the time. That assault came two weeks to the day after a similar attack in which suspected Islamist suicide bombers killed more than 50 people in four different explosions on buses and underground trains in the British capital. It sparked the biggest manhunt ever undertaken by British police. In a tense stand-off in west London on Friday, officers in gas masks and protective clothing surrounded a flat in the Notting Hill area where they were later seen leading a man away. There were other operations across London including the arrest of two women at Liverpool Street Station, where a suspect package was investigated. Police had been under pressure to exercise caution after they shot dead a Brazilian man whom they mistook for a suicide bomber last week.