The so-called Islamic State (IS) was behind a series of explosions and gun attacks in the capital Jakarta, an IS-linked news agency and police say, the BBC reports.
At least two civilians and five attackers died in the assaults, described as an attempt to mimic the deadly Paris attacks.
Security forces battled militants for hours, with the attacks centring on a major business and shopping district.
It follows warnings late last year that Islamists were planning a major attack.
