US Attorney General Eric Holder and other officials will speak at a ceremony at Virginia's Arlington National Cemetery to remember the 270 victims killed in the Lockerbie disaster. Flags were held by servicemen, as the names of those killed were read out.
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Andrew Warren and US professor Wyndham Lathem have been charged with murdering a 26-year-old man in Chicago.
There will be a few showers in the north, but otherwise dry for many with warm sunny spells before heavier rain in the south west.