NEW : 36-year - old man held on murder , kidnapping , other charges . NEW : Suspect picked up Friday , questioned overnight . Two guards killed in armored vehicle accident outside bank ; a third guard wounded . Guards were servicing drive - up truck outside Philadelphia bank .
NEW : 36-year-old man held on murder , robbery , other charges . NEW : Suspect picked up Friday , questioned overnight . Two guards killed in armored vehicle attack outside bank ; a third guard wounded . Guards were servicing drive-up ATM outside Philadelphia bank .