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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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A doctors' group says it "borders on madness" that patients will have to obtain the note in person.
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A Nasa-funded robot has blasted off to catch a falling telescope in mid-orbit and blast it back to safety before it burns up.