London police are treating as credible claims that a VIP parliamentary sex ring murdered three boys in the 1970s and early 80s.

They've interviewed a witness to events.

It's alleged that boys in care homes from Wales were bused down to a flat in Westminster in weekends, plied with alcohol and abused by powerful men - including judges and politicians.

Sky's Tom Parmenter says there've been rumours swirling around over this for some time.

"But the police will not yet say who their suspects are or exactly what the links might be to important, powerful people of the time."