Apparently, a quick-thinking security worker with great gut instincts was alerted/suspicious about someone, and his gut was right. It ended up being an Arab terrorist equipped with bombs and a plan to blow up the train.
Thank Gd for giving the security guy not only the knowledge but the guts to act on his suspicions. Praise the Lord!
*Nowadays many families have whatsapp groups for easy and real-time communication and picture sharing.