"The army and police are under high alert," he told reporters after attending a meeting chaired by President Susilo Bambang Yudhoyono. "We want to guarantee safety."
Indonesia, the world's most populous Muslim nation, was thrust onto the front lines in the battle against extremists in 2002 after al-Qaida-linked militants attacked two nightclubs on Bali island, killing 202 people, many of them foreign tourists.
There have been several attacks since then targeting glitzy hotels, restaurants and an embassy, killing another 60.
In recent months, militants have shifted their focus to local "enemies," including police on anti-terror operations, members of a minority Islamic sect, moderate Muslim leaders and Christians.
Four people were wounded in the parcel bombings, none seriously.
The arrested men eventually led police to the gas pipeline near a church in the city of Serpong, southwest of Jakarta, where they found the massive bomb.
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