The busiest part of downtown Jakarta was assaulted Thursday with suicide bombers, grenades and gunfire at some 8 different spots, killing at least 7 people, including a policeman and injuring dozens. There were explosions near the presidential palace, a UN office and the Pakistani and Turkish embassies and centered on the Starbucks café and Burger King, while two gunmen attacked a nearby police post. Witnesses report 15-20 terrorists taking part in the multiple attacks. No organization has taken responsibility, but Indonesia suffered several attacks by Islamist terrorists in recent years. Since November, Indonesia has been on high alert for attacks on attack government officials and foreigners. Last year, it was reported that at least 50 Indonesians had traveled to Syria to join the Islamic State fighting there.