Saudis alerted Britain to looming London attacks: Sunday papers

"LONDON (AFP) - Saudi officials alerted Britain several weeks before the deadly July 7 bombings in London that a terror attack was being planned, two Sunday newspapers reported.

The Observer quoted a security official in the Saudi capital Riyadh as saying that information was passed to MI5 and MI6, Britain's domestic and foreign intelligence agencies respectively."
Yahoo

From Drudge