Police say they are questioning an individual over "suspicious envelopes". Two letters - one addressed to Barack Obama and the other addressed to Senator Roger Wicker - have been found to contain the poison ricin.
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MPs called for better support for working fathers to help them care for their children.
Some 20% of carriageways in England and Wales have less than five years of life remaining before they become unusable, researchers said.
The star - who played Miranda Hobbes in the hit New York-set show - posted a message on Twitter announcing her run.