CAMBRIDGESHIRE, ENGLAND—Hundreds of police in England and Northern Ireland conducted raids leading to the arrest of 17 men and two women, who have been connected to six thefts of Chinese antiquities from auction houses and museums, including The Fitzwilliam in Cambridge. Many of the stolen artifacts have not been recovered. “The series of burglaries last year had profound effect on museums and similar institutions and we are committed to bringing all those who were involved in the conspiracy to justice,” said Chief Constable Mick Creedon. Eight people have already been convicted and jailed for these crimes.