听力原文： French police say they have narrowly headed off a new bomb attack and arrested a man of ficials call a key figure in a three month wave of bombings. Police seized bomb components in the Northern City of Lille and detained an Algerian in Paris. They say, they have arrested the man rather after they heard him on a tapped telephone give orders to plant a bomb in the busy Lille market on Sunday. The French police arrested a man because ______.