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Officials believe the suspect may not have acted alone and spent days casing out the scene of the attack.
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Tusk says Poland is preparing for "various" scenarios after media reports of a planned Russian attack.
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Forecasters are warning of further extreme temperatures on the continent in the next few days.
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The disaster has overwhelmed local services, with bodies put outside or in tents for identification.
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Ali Khamenei's body will lie in state in Tehran's Grand Mosalla from Friday ahead of days-long funeral events.