Gadhafi forces try to block Libyan rebel advance  ZAWIYA,
Libya -- Moammar Gadhafi's forces pushed rebels back from the
center of the strategic city of Zawiya on Monday in fierce
fighting to try to prevent the opposition from consolidating a
major advance to within 30 miles of the capital Tripoli.  In
neighboring Egypt, Libyan Interior Minister Nassr al-Mabrouk
Abdullah flew into the capital Cairo on his private plane with
nine family members, Egyptian airport officials said. He came
from Tunisia and entered on a tourist visa in what could be a
high-level defection. No Libyan embassy officials greeted him at
the airport.  "We had no idea of his arrival, but he was in
Tunisia on Sunday," a Libyan embassy official in Cairo told The
Associated Press. All officials spoke on condition of anonymity
because they weren't authorized to speak to the media. The
Libyan embassy official confirmed that Abdullah is the interior
minister.  The minister arrived after a weekend of significant
advances by rebels from Libya's we