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Lukasz Pawlowski cut his throat with a kitchen knife as he was due to be sentenced in Havefordwest. He has been remanded in custody.
More than 1.85 million people have called for the US president's visit to be watered down to avoid causing "embarrassment" to the Queen.
Jim Mattis arrived in Baghdad on the day after US-backed Iraqi forces launched an operation to reclaim Mosul from IS.