At least five people were killed and around 60 wounded in the bombing in May of a new church building during a service to mark its official opening.
An explosive device was thrown into the church compound in Olasti, a predominantly Christian suburb of Arusha, on May 5. Senior church figures were in attendance for the inaugural service.
A Barnabas Fund contact in Tanzania said that radical camps in the country were teaching young Muslims that Christians must be killed or live as second-class citizens. He said that senior Christian leaders had reported details of these camps to the authorities, but no serious action had been taken against them.
Eight suspects have been arrested — four Saudi Arabians and four Tanzanians.
Police had previously warned of the potential threat of violence by al-Qaeda and Somalia-based al-Shabaab, which has been behind a number of anti-Christian incidents in neighbouring Kenya.
Opposition MPs on May 5 accused the government of being the main cause of religious tension in the country. Tundu Lissu said that the government was implicitly supporting the perpetrators by keeping silent on the bombing and torching of churches and killing of religious leaders.
