听力原文： Algerian police, looking for three kidnapped French nationals, are searching vehicles at roadblocks in downtown Algiers. The van used in Sunday's kidnapping was, found abandoned in the area. An Algerian police chief says the captives may still be alive. Seven foreigners have been killed over the last month by suspected Moslem extremists fighting to topple the government. France is urging families 6f French nationals in Algeria to come home. The kidnapping took place ______ .