Philadelphia police say the deadly Grays Ferry mass shooting was a case of 'contagious gunfire' and a total of 13 guns were fired indiscriminately. One suspect has been arrested and charged in the incident.

Philadelphia police say officials will have more information on the July 7 mass shooting that killed three people.

Philadelphia Police have announced an arrest in the July mass shooting in Grays Ferry that killed 3 people and injured 11 others. Editor’s note: The video above is from a prior report. According to police,