National Police spokesman Maj Gen Anton Charliyan says the suspects were captured in two separate places Wednesday in Bekasi, a West Java town bordering with eastern Jakarta.
The arrests of Arif Hidayatullah, alias Abu Mush'ab, and Alli, the Uighur who used a fake identity card, came as security has been stepped up after officials described a credible threat of attacks, especially against minority Christians, during the year-end holidays.
The government has deployed 150,000 security personnel to safeguard churches, airports and other public places across this predominantly Muslim nation.