The New York killer of two firemen left a note on his plan to "do what I like doing best, killing people".
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The Republican nominee said that "all she wants to do is campaign" before accusing Mrs Obama of attacking Hillary Clinton.
26 people injured and five people were taken to hospital after a bus crashed into a railway bridge.
Trinity Gay was shot dead in a car park outside a restaurant on Sunday following reports of an exchange of gunfire between two vehicles.