Police fought running battles with rioters in central Paris last night as youths attacked officers with bangers, bottles and concrete at the end of a mass demonstration against a youth employment law that has caused a political crisis for Jacques Chirac's ruling party. Trade unionists and student leaders said up to three million people took to the streets across France yesterday - the second time in eight days that the country has seen its biggest street demonstrations in almost 40 years. The protests, including one by hundreds of thousands of students and scholars who marched through central Paris, were mainly...