WARNING - STORY CONTAINS GRAPHIC IMAGES<br/> <br />Amateur video obtained by ITV news shows a man with bloodied hands and a knife just after a man was killed near an army barracks in London.<br/> <br />Media reports say the dead man was a British soldier who was hacked to death by unidentified assailants. Some reports suggested his attackers tried to behead him while shouting "God is greatest" in Arabic.<br/> <br />British Prime Minister David Cameron called an emergency security meeting after the man was killed.<br/> <br />Britain's government convenes meetings of its emergency security committee only to deal with incidents that have implications for national security.<br/> <br />London's mayor said it was overwhelmingly likely the killing was a terrorist attack.<br/> <br />Security was tightened in the area immediately after the attack but details are sketchy.
