Vice President Nicolas Maduro has said that President Hugo Chavez is suffering his "most difficult hours" since his latest cancer operation on December 11.
Holding a copy of the nation's constitution, he called on Venezuelans to "respect Commander Chavez" at this "difficult time".
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A suspected drunk driver ploughed into a crowd during Mardi Gras celebrations in the southern US city.
The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.