National police spokesman Anton Charliyan has told reporters a black IS flag was found with one of the Jakarta attackers and police believe they have established their identities.
He said two of the five men were previously convicted and imprisoned for terrorism offenses. He did not release any names
Five men attacked a Starbucks cafe and a traffic police booth with hand-made bombs, guns and suicide vests Thursday, killing two people and injuring 20. The attackers were killed.
The scene of the deadly attack, in Jakarta's downtown business area, has been sealed off with metal fences. Traffic was flowing normally on Friday morning.