New arrest over London attack as govt eyes WhatsApp

British police investigating a deadly attack on parliament made a new arrest Sunday as officials set their sights on accessing WhatsApp, the heavily-encrypted messaging service that was used by the killer.The latest arrest was a 30-year-old man who was detained in the central city of Birmingham on suspicion of preparing terrorist acts, London's Metropolitan Police said.A dozen people have been arrested since Wednesday's attack by 52-year-old Khalid Masood who deliberately ran down pedestrians on