UK: Attacker used WhatsApp, message can’t be accessed

LONDON — Westminster Bridge attacker Khalid Masood sent a WhatsApp message that cannot be accessed because it was encrypted by the popular messaging service, a top British security official said Sunday.British press reports suggest Masood used the messaging service owned by Facebook just minutes before the Wednesday rampage that left three pedestrians and one police officer dead and dozens more wounded.As controversy swirled over the encrypted messages, police made another arrest in Birmin