People are seen outside Saint Joseph catholic church following a suspected terror attack by a knife-wielding assailant on a priest during the Sunday service in Medan, North Sumatra, Indonesia August 28, 2016 in this photo taken by Antara Foto. Antara Foto/Irsan Mulyadi/via REUTERS

People are seen outside Saint Joseph catholic church following a suspected terror attack by a knife-wielding assailant on a priest during the Sunday service in Medan, North Sumatra, Indonesia August 28, 2016 in this photo taken by Antara Foto. Antara Foto/Irsan Mulyadi/via REUTERS

People are seen outside Saint Joseph catholic church following a suspected terror attack by a knife-wielding assailant on a priest during the Sunday service in Medan, North Sumatra, Indonesia August 28, 2016 in this photo taken by Antara Foto. Antara Foto/Irsan Mulyadi/via REUTERS

August 28, 2016 3:23 AM (UTC+8)