By Michael Holden LONDON (Reuters) - More than 700
Britons are thought to
have traveled to Syria and
over a
half have since returned
home where they **w pose a significant terrorism threat, British
Police said on Thursday. Mark Rowley, the lead ******r on counter-terrorism, also said there had been a record 338 arrests for terrorism-related offences last year, up by a third from 2013, with almost a
half related to the conflict in Syria. Rowley said of the 700
Britons who were believed to
have gone, "a significant proportion" were thought to
have tried to join Islamic State (IS) militants who
have taken
over swathes of Syria and Iraq.
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