A look at the key known facts about the Wednesday attack in south London, when two men hacked another to death near military barracks.

SOFIA (Reuters) - Bulgaria's largest party GERB declined on Thursday to try to form a new government, opening the way for the rival Socialists to put together a technocrat administration and end a political impasse. The center-right GERB won most seats in a May 12 election in the European Union's poorest country but cannot command a majority, as other parties are shunning it after its resignation during protests against low living standards in February. ...