UK police face parliament on tabloid phone hacking (AP)

Britain's police watchdog cleared four senior police officers of misconduct over their role in the London police's widely criticized 2006 investigation into phone hacking at the News of the World tabloid.

The scandal over claims Britain's top-selling Sunday tabloid hacked the phone of a murdered teenager took a new turn as further allegations emerged and the prime minister called for a "vigorous" investigation.It emerged late Tuesday that the parents of the victims in another prominent murder case, schoolgirls Holly Wells and Jessica Chapman, have been contacted by detectives investigating phone hacking at the News of the World.Prime Minister David Cameron said police should pursue their investigation into the claims in "the most vigorous way".