Spain investigates missing imam, mysterious explosion

RIPOLL, Spain — A missing imam and a house that exploded days ago became the focus Saturday of the investigation into an extremist cell responsible for two deadly attacks in Barcelona and a nearby resort, as authorities narrowed in on who radicalized a group of young men in northeastern Spain.Investigators searched the home of Abdelbaki Es Satty, an imam who in June abruptly quit working at a mosque in the town of Ripoll, the home of the Islamic radicals behind the attacks that killed 14 p