Morning Buzz: May 22, 2007

This morning's top stories:

• A deadly clash between Lebanese troops and Fatah Islam militants in a refugee camp in northern Lebanon enters its third day today.
• Meanwhile, Israel struck two camps suspected of use by Hamas after a rocket attack killed a woman in southern Israel.
• The explorers who recovered a valuable Colonial-era shipwreck worth up to $500 million say they have been inundated with calls for the movie rights and other claims to their story.
• The bubonic plague has been identified as the culprit in the death of a monkey in the Denver Zoo, Reuters reports.