Berlin — Germany searched for answers on Monday on possible security lapses after a man drove his car into a Christmas market, killing at least five people and casting a renewed spotlight on security and immigration ahead of a snap election. The possible motive of the arrested suspect, a 50-year-old psychiatrist from Saudi Arabia with a history of anti-Islamic rhetoric and a sympathy for the far-right Alternative for Germany (AfD) party, remains unknown. As a nation mourned, with citizens leaving flowers and lighting candles in Magdeburg where the incident took place on Friday, questions swirled about whether more could have