By Steve Scherer and Gabriele Pileri GIGLIO, Italy, Jan 20 (Reuters) - The vast wreck of the cruise ship Costa Concordia shifted on its undersea ledge on Friday, forcing a new suspension of rescue work and threatening plans to pump oil out to prevent environmental disaster. Firefighters' spokesman Luca Cari said rescue squads would be discussing the next step after the movement made conditions unsafe for divers already hampered by poor visibility, floating objects and underwater debris.
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