Rioters clash anew with Greek police in Athens

Hundreds of rioters have battled police in central Athens, fire-bombing a credit reporting agency and attacking the city's Christmas tree two weeks after the police shooting of a teenager set off Greece's worst unrest in decades. Saturday's violence followed a memorial gathering at 9 p.m. where 15-year-old Alexandros Grigoropoulos died December 6, in the Athens neighborhood of Exarchia. The rioters, using the National Technical University of Athens as a base, launched attacks against police, throwing rocks and petrol bombs and erecting roadblocks. Security forces are prevented by law from entering the university grounds unless the school administration gives the go-ahead, but so far no permission has been given.