BP says pressure tests indicate the cement plug forced into blown-out gulf well has hardened and is firmly in place, clearing the way for drilling of the relief well to resume. The company did not say when it would begin drilling the final 100 feet of the well, though BP Senior Vice President Kent Wells has said it should resume Sunday night. Once the relief well intersects the broken well, more mud and cement will be pumped in for the "bottom kill" meant to seal the well for good.