The police officer who fatally shot 18-year-old Michael Brown did not know that he was a suspect in a convenience store robbery, Ferguson Police Chief Thomas Jackson said Friday.Jackson said the officer, previously identified as 28-year-old Darren Wilson, initially stopped Brown and a friend â€because they were walking down the middle of the street blocking traffic.†Police earlier Friday released security footage they said showed Brown grabbing a box of cigars from a convenience store and then shoving the clerk away to leave.Daryl Parks, an attorney for the Brown family, confirmed that the security footage “appears to look like†the teenager,...