Amsterdam police have busted seven people linked to a large-scale bomb plot in the city, authorities announced. An anonymous tipster told police the terror gang was planning an action aimed at "claiming casualties in busy places"; targets included megastores, reports the BBC. Several stores and a movie theater were closed, and a concert by The Killers was canceled as a precaution. All those arrested have joint Dutch and Moroccan citizenship. One is related to a suspect in the 2004 Madrid train bombings.