By Guy Taylor A 17-year-old boy has been arrested in Walsall in connection with a major cyber security incident affecting Transport for London (TfL). The NCA said the teenager had been detained on suspicion of breaching the Computer Misuse Act in relation to the attack, which first impacted TfL on 1 September. “We have been working at pace to support Transport for London following a cyber attack on their network, and to identify the criminal actors responsible,” deputy director Paul Foster, head of the NCA’s National Cyber Crime Unit, said. “Attacks on public infrastructure such as this can be…