Italian broadcaster RAI has shown footage purporting to show the rescue operation underway off the coast of Sicily.
What appears to be the hull of a boat is visible under the green and red vessel.
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A woman who was "dragged away" by a crocodile as her friend tried in vain to rescue her is reportedly still missing in Australia.
Police say at least one gunman armed with a high-powered rifle, began "shooting randomly" resulting in the death of a man in his 50s.
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