Police officers react near the site of a blast in Jakarta, Jan. 14

JAKARTA — Suicide bombers and gunmen attacked the heart of Indonesia’s capital on Thursday and the assault was claimed by ISIS, the first time the radical group has targeted the world’s most populous Muslim nation.

Seven people were killed in Jakarta despite multiple blasts and a gunfight, and five of them were the attackers themselves, but the brazenness of the assault suggested a new brand of militancy in a country where low-level strikes on police are common.

It took security forces about three hours to end the attack near a Starbucks cafe and Sarinah, Jakarta’s oldest department store, after a team of militants traded gunfire with police and blew themselves up.

An Indonesian and a Canadian were killed in the attack. Twenty people, including an Algerian, an Austrian, a German and a Dutch national, were wounded.

“A group of soldiers of the caliphate in Indonesia targeted a gathering from the crusader alliance that fights the Islamic State in Jakarta,” the group said in a statement. It added that 15 people were killed.

Jakarta’s police chief told reporters: “ISIS is behind this attack definitely,” and he identified an Indonesian militant, Bahrun Naim, as the man responsible for plotting it.

Police believe Naim is in the Syrian city of Raqqa.