JAKARTA, Indonesia -- The scene had echoes of the Paris attacks: A bustling shopping area shaken by the blasts of suicide bombers and gunfire as onlookers fled in terror.

But when Thursday's assault in central Jakarta was over, the death toll was far lower. Of the seven killed, five were the attackers themselves, and only two were civilians -- a Canadian and an Indonesian. Another 20 people were wounded.

Still, authorities and analysts said the violence that left the city of 10 million on edge for hours was a loud announcement of the Islamic State group's presence in the world's largest Muslim-majority nation.

Supporters of the Islamic State group circulated a claim of responsibility on social media resembling the militants' previous messages.

The attackers carried handguns, grenades and homemade bombs and struck a Starbucks cafe and a traffic police booth in the Indonesian capital's highest-profile attack in six years.

Authorities said they found a large, undetonated bomb and five smaller devices in a building near the cafe.

"So we think ... their plan was to attack people and follow it up with a larger explosion when more people gathered," said Maj. Gen. Anton Charliyan, the spokesman of Indonesia's national police. "But thank God, it didn't happen."

Jakarta police chief Maj. Gen. Tito Karnavian said the attackers had links with IS and were part of a group led by Bahrum Naim, an Indonesian militant who is in Syria.

"We have identified all attackers," Charliyan said. "We can say that the attackers were affiliated with the ISIS group," he added, using an acronym for the Islamic State group.

The claim was shared on Twitter late Thursday, and the U.S.-based SITE Intelligence Group said it also was circulated among pro-IS groups on other media.

The message said attackers carried out the Jakarta assault and had planted several bombs with timers. It differed from Indonesian police on the number of attackers, saying there were four. It said they wore suicide belts and carried light weaponry.

The statement could not be independently verified by The Associated Press, though it resembled previous claims made by the group, which controls territory in both Iraq and Syria.

Jakarta is no stranger to terrorism, with the 2009 bombings of two hotels that killed seven people and injured more than 50. The bloodiest attack by Islamic extremists in Indonesia -- and in all of Asia -- was in 2002, when a nightclub bombing on the resort island of Bali killed 202 people, mostly foreigners.

Those and others were blamed on the al-Qaida-inspired Jemaah Islamiyah. Following a crackdown by security forces, militant strikes in recent years have been smaller and less deadly, and have targeted government authorities, mainly police and anti-terrorism forces. Terrorism experts said IS supporters in Indonesia are drawn from the remnants of Jemaah Islamiyah.