Media said six bombs went off and a Reuters witness saw three dead people and a gunfight going on. One blast was in a Starbucks cafe and security forces were later seen entering the building.

Police said they suspected a suicide bomber was responsible for at least one of the blasts and up to 14 militant gunmen were involved in the attack, Metro TV reported.

“The Starbucks cafe windows are blown out. I see three deadpeople on the road. There has been a lull in the shooting butsomeone is on the roof of the building and police are aimingtheir guns at him,” said a Reuters photographer.

Indonesia has been on edge in recent weeks over the threatposed by Islamist militants and counter-terrorism police havelaunched a crackdown on people with suspected links to Islamic State.

“We have previously received a threat from Islamic Statethat Indonesia will be the spotlight,” police spokesman AntonCharliyan told reporters. But he said police did not know whowas resposible.

He said three policemen and three civilians had been killed.

“I saw a police officer shot right in front of me,” onewitness told TV One.

One explosion went off in front of a shopping centre calledthe Sarinah mall, on a main avenue. Media said a police postoutside the mall was blown up.

Police snipers were deployed among hundreds of othersecurity officers.

A U.N. building near the scene was in lock-down with no oneallowed in or out, a witness said. Some other high-risebuildings in the area were evacuated.

Indonesia’s central bank is located in the same area, and aspokesman for the bank said a policy meeting was going ahead anda decision on interest rates would be announced as planned laterin the day.

An explosion was heard in the western suburb of Palmerah,according to a domestic media tweet, but police said they couldnot confirm a blast there.

Indonesia has the world’s largest Muslim population, thevast majority of whom practise a moderate form of the religion.

The country saw a spate of militant attacks in the 2000s,the deadliest of which was a nightclub bombing on the holidayisland of Bali that killed 202 people, most of them tourists.

Police have been largely successful in destroying domestic militant cells since then, but officials have more recently beenworrying about a resurgence inspired by groups such as IslamicState and Indonesians who return after fighting with the group.

The last major militant attacks in Jakarta were in July 2009, with bombs at the JW Marriott and Ritz Carlton hotels.

– Reuters