The 18-year-old man from the Grangetown area of Cardiff who was arrested earlier today under Section 5 of the Terrorism Act has been released on bail, police said.
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On Friday, police said it appeared the girl had shot herself in the face with the weapon.
The showers will be slow-moving, heavy and thundery at times, particularly in central and eastern areas.
Ratings agency Moody's said victory for Brexit would "herald a prolonged period of uncertainty" for the UK.