Attacker slashes man in London metro 'terrorist incident'

(Note strong language in paragraph 14) By James Davey LONDON (Reuters) - A man wielding a knife slashed a man in an east London metro station on Saturday, reportedly screaming "this is for Syria", before police used a stun gun to subdue him in what they described as a terrorist incident. A pool of blood near the ticket barriers at the Leytonstone Underground station, about six miles (10 km) east of central London, could be seen in footage posted on Twitter that also showed the suspect confrontin