Initial signs are good ... although I had read that we wouldn't know anything solid for at least two days ...

HOUSTON, May 26 - BP Plc Chief Operating Officer Doug Suttles said on Wednesday it appears drilling mud, not oil, was gushing from a ruptured undersea well six hours into an effort to halt a month-old oil spill.

"What you've been observing coming out of the top of that riser is most likely mud," Suttles said at a news conference broadcast from a Louisiana command center. "We can't fully confirm that because we can't sample it. And the way we know we've been successful is it stops flowing."