Florida free: a demonstration supporting Trayvon Martin in Los Angeles, California. Photograph: Jonathan Alcorn/Reuters

In 2010, Marissa Alexander, a 31-year-old mother of three, fired a warning shot to scare off her abusive husband during a row at her home, in Florida,(...)

A protester  walks past a line of Los Angeles police officers as they try to remove protesters following the George Zimmerman verdict.   Photograph: Jason Redmond/Reuters

President Barack Obama last night called for “calm reflection”, after a Florida jury’s acquittal of neighbourhood watch man George Zimmerman for the m(...)