Indonesian police say they have arrested 10 members of the Islamic militant group Jemaah Islamiyah (JI).
JI is suspected of a bombing campaign against churches and other crimes.
Nineteen people were killed in the Christmas Eve 2000 bomb attacks in the cities of Medan and Pekanbaru on the Indonesian island of Sumatra.
Chief Detective Lieutenant General Erwin Mapasseng said the 10 had taken orders from Riduan Isamuddin, also known as Hambali, who allegedly led JI operations at the time.
The 10 suspects were picked up on Sumatra in separate operations between 12 and 16 June.
None of the 10 has yet been charged.
