Authorities are investigating whether the terrorists who
allegedly killed a serving British soldier in a London street on
Wednesday had connections to Nigeria. WSJ's Cassell Bryan-Low
reports on the attack that U.K. Prime Minister David Cameron has
described as "sickening."  LONDON—The gruesome broad-daylight
killing of a man believed to be a British soldier was quickly
branded an act of terrorism by officials here, reviving fear of
violence by Islamic extremists in a country that has spent years
buttressing its defenses in the wake of past attacks.  The
victim, who wasn't identified Wednesday, was hacked to death
outside an army barracks in southeast London, police said.
Police arriving on the scene shot two suspects, who survived and
were taken to area hospitals.   Videos from witnesses quickly
surfaced of a man with bloodied hands, apparently in the
immediate aftermath of the incident, holding a large knife and a
cleaver, and making antigovernment statements. "We swear by the
almighty Allah we will never s