On the investigation end, the British government has yet to identify who was behind the bombings. On Saturday investigators revealed that the three subway blasts occurred within a span of fifty seconds. Initial reports had the bombings occurring nearly a half hour apart. The Guardian of London reported last night that Britain’s security alert had been raised to its highest level–“severe specific” alert. The upgrading indicates that the security services believe that the perpetrators of the attack are still at large. The after effects of the bombings continue to be felt across the country. In the industrial city of Birmingham, police evacuated twenty thousand people on Saturday night for security reasons.