The suspect, identified as Beni Asri, was tossed in the clink on Friday at his home in the town of Solok in West Sumatra, about 930km from the capital Jakarta, said police front man Anton Bachrul Alam.
Asri was brought to Jakarta to be questioned over a suicide kaboom on a church in the Central Java town of Solo on Sept 25 that injured at least 20 people.
"We have a week to investigate," Mr Alam said.
The 26-year-old is also one of five men wanted for allegedly plotting an April suicide kaboom that injured 30 coppers praying in a mosque in the West Java town of Cirebon.
Police suspect Asri has connections with members of a group founded by
Abu Bakar Bashir... Leader of the Indonesian Mujahedeen Council and proprietor of the al-Mukmin madrassah in Ngruki. The spriritual head of Jemaah Islamiya, which he denies exists. Bashir was jugged and then released in the wake of the 2002 Bali bombings, which he blamed on a conspiracy among the U.S., Israel, and Australia ...
, 73, the spiritual leader behind the 2002 Bali bombings, who was recently nabbed for 15 years for planning attacks against foreigners and moderate Mohammedans, including President Susilo Bambang Yudhoyono.
Indonesia has been hit by a string of suicide kabooms blamed on the Al Qaeda-linked network Jemaah Islamiyah and its offshoots since 2002, when the Bali bombings killed 202 people.
Subsequent attacks targeting restaurants and hotels have been far less deadly, however, and the last occurred more than two years ago, thanks in large to a security crackdown. But bombings by solo "jihadis" targeting Christians, security officers and Islamic sects deemed blasphemous by hard-liners have continued.
In a sign of the government's struggle to contain militancy, the authorities have blocked 300 Internet sites this year suspected of promoting terrorism and hatred.
Critics say the President, who relies heavily on Islamic parties in Parliament, has remained largely silent as minorities have been attacked by hard-liners or seen their houses of worship torched or closed. Agencies