UK police hunt Manchester bomber's network, angered by U.S. leaks

By Michael Holden and Andy BruceMANCHESTER, England (Reuters) - Police scrambled to close down a network around the Manchester suicide bomber with arrests in Britain and Tripoli on Wednesday, as details about the investigation were leaked to U.S. media, infuriating authorities who fear a second attack is imminent.British-born Salman Abedi, 22, who was known to security services, killed 22 people at a concert venue packed with children on Monday.Manchester police arrested five men and one woman o