Muslim worshippers gather after a suicide bomber detonated a device near the security headquarters of the Prophet's Mosque in Medina, Saudi Arabia, July 4, 2016. REUTERS/Handout

Muslim worshippers gather after a suicide bomber detonated a device near the security headquarters of the Prophet’s Mosque in Medina, Saudi Arabia, July 4, 2016. REUTERS/Handout

Muslim worshippers gather after a suicide bomber detonated a device near the security headquarters of the Prophet's Mosque in Medina, Saudi Arabia, July 4, 2016. REUTERS/Handout

July 4, 2016 11:32 PM (UTC+8)