(BARCELONA, Spain) — Authorities in Spain searched Saturday for a member of an Islamic extremist cell that staged vehicle attacks in Barcelona and a seaside resort, focusing on links with his Moroccan comrades, a missing imam believed to have radicalized them and a house that blew up days ago. Catalan police said the manhunt was centered on Younes Abouyaaquoub, a 22-year-old Moroccan suspected of driving the van that plowed into a Barcelona promenade packed with pedestrians Thursday, killing 13 people and injuring 120.