Rescuers have "four credible leads" in the search for missing adventurer Steve Fossett, a spokeswoman for the Nevada Civil Air Patrol said Thursday.

Maj. Cynthia Ryan, who is leading the search, would not elaborate during a press conference that focused mostly on logistics.

The search has been expanded to 10,000 square miles, Ryan said. It had been 600 square miles. Read full article »

CNN's Ted Rowlands contributed to this report.

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