Forensic scientists have examined the debris after two bombs ripped through a market in a Christian dominated town in Indonesia, killing at least 20 people. Church leaders called for calm in the aftermath of the blasts, which were blamed on Muslim extremists. They were the deadliest attack in the world's most populous Muslim nation since the 2002 nightclub bombings on Bali island. At Tentena's only hospital, nuns led special prayers and sang hymns in wards crowded with the wounded. Doctors who had been working through the night complained of a shortage of medicines and surgeons.