Three Indonesian police officers were killed and 10 people injured on Thursday when two suspected suicide bombers struck near a bus stop in the capital. Twin explosions went off about five minutes apart near the site of a parade at Jakarta’s Kampung Melayu terminal, police said. “The police officers were on duty to guard a group of people who were holding a parade. The parade hadn’t passed yet when the blast happened,” National Police spokesman Setyo Wasisto said after the attack, Reuters reported. Five of those injured were police officers, while five civilians were also wounded, he said. Authorities have not yet confirmed whether the attack was carried out by Islamist extremists, but Jakarta has been the site of several attacks by supporters of the so-called Islamic State in recent years. Authorities have warned that about 400 Indonesian citizens have joined the terrorist group in Syria and may launch attacks upon their return.