In a cruel twist of fate, an Australian family who lost two of their members in the MH370 crash learned on Friday that two more from their extended family were on the ill-fated Malaysian plane shot down over Ukraine.
Scotland Yard's Counter-Terrorism Command investigating the attack arrested the 25-year-old from Newport.
Earlier, an 18-year-old man was arrested in the port area of Dover. None of the suspects have been named.
British Prime Minister Theresa May said military personnel would replace armed police "on guard duties at certain protected sites which are not accessible to the public".
