Gwent Police are appealing for information about the whereabouts of 16-year-old Chantelle Vickery from Newport.
She was last seen in the Bettws area at about 2pm on Wednesday May 16th
Police say there is a possibility Chantelle could be in the Cardiff area, and she also frequents the Pill area and Central Library areas of Newport.
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David John Woods and Leslie Peter Baines are said to have carried out “a savage and brutal attack” on Matthew Cassidy, in May last year.
The man is said to have approached the 11-year-old riding on his bike and offer him a lift home.
It is believed weapons, including possibly a small axe, were used in the street fight in the Llanrumney area of Cardiff.