Police say Hopson was involved in a Michael Brown protest and was wearing a backpack containing a firearm. They say officers saw Hopson firing shots into a fleeing crowd on West Florissant.
After purchasing an item, the suspect displayed a firearm and demanded money. He then left the store with an undisclosed amount of money in an unknown direction.
A man has been charged for a string of robberies in the last week, including two in which the victims were Saint Louis University students.
Thieves steal safe from Family Dollar store using tow truck.
Ricky Lane, Jr. is accused of holding up two stores in north St. Louis.
He wears sunglasses, wigs and baseball caps.