Two cousins aged 14 and 15 have been reported missing from their home in Newton Aycliffe.
Thomas and Kieran Miller have not been seen since Sunday.
The police say they are concerned because of the age of the boys.
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A Stockton man who threatened to kill Muslim people in an online rant after the London Bridge terror attacks has been jailed for 20 months.
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From March 1, the paper £10 note will cease to be legal tender - replaced completely by the polymer version.