The suspect, identified as 17-year-old Ivan Armadi is under interrogation.
All outsiders should withhold unnecessary comments, said Indonesia's Environment Minister Siti Nurbaya Bakar.
Police say the 17-year-old boy was sitting among the morning mass congregation at the St. Yoseph Catholic Church.
This is the second incident of death in Japan that has been related to the wildly popular augmented reality game, Pokemon Go.
Major Tan says 17 commandos were also injured in the clash with about 100 Abu Sayyaf bandits.
Sources say the volcanic earthquake has continued to occur with eruptions of the ash cloud that goes as far as 3.000 meters from the crater.
President Tony Tan Keng Yam presents the State Flag and Accoutrements to late president Nathan's son Osith Ramanathan.
Authorities say that this is the third deadly military plane accident since June.
Authority confirms that the decapitated head was of Patrick Almodovar, who was kidnapped about a month ago.
The quake lasted for about three seconds and the tremors were felt in Ranau, Kota Kinabalu, Penampang and Tuaran.
The State Funeral Procession for the late former President SR Nathan will start at 2 pm on Friday.
Authorities say Vier Harmoni was found on Wednesday off West Kalimantan province, on the Indonesian part of Borneo Island.
The National Police Agency of Japan says this is the first death reported in Japan related to Pokemon Go.
Tremors were also felt across neighbouring countries like Thailand, India and Bangladesh.
Defence Minister Prawit Wongsuwan says there is no link between the latest bombings and the seven provinces attacks.