Police arrest second man over London train bombing

By Paul SandleLONDON (Reuters) - A second man has been arrested over Friday's bombing of a London commuter train that injured 30 people and Britain remained on its highest level of alert on Sunday with soldiers helping provide security.The 21-year-old man was detained under Britain's Terrorism Act in the west London suburb of Hounslow just before midnight on Saturday, the Metropolitan Police said in a statement.Police arrested an 18-year-old man in the departure lounge of Dover port earlier on S