Indonesia will deport a Singapore-based terrorism expert because he was conducting research in the troubled province of Maluku without a proper visa.

Rohan Gunaratna was arrested earlier this week in the region, where vicious fighting between Muslims and Christians from 1999 to 2002 killed more than 5,000 people.

Mr. Gunaratna, a Sri Lankan, is the author of the book, Inside al Qaeda: Global Network of Terror. He is a frequent commentator on Islamic militancy and terrorism in Asia.

Police say he was using a tourist visa while doing research in Maluku. They say Mr. Gunaratna will be flown to the capital of Jakarta Friday and then deported.

Some information for this report provided by AP and Reuters.