A Bangladesh court has sentenced a member of an outlawed Islamist group to 15 years in prison for involvement in serial bomb attacks across the country in August, a police officer said on Monday. Two people were killed and almost 100 wounded when 500 bombs went off on August 17, blamed on Islamist militant groups fighting to turn Bangladesh, a mainly Muslim democracy, into an Islamic sharia state.The court in Kishoreganj town, 150 km (95 miles) from Dhaka, found Obaidullah Suman, an activist of the Jamaat-ul-Mujahideen group, guilty of possessing bombs and helping plant them, a court official said. The sentencing was the first since almost 800 suspected militants were detained. "The verdict will act as an warning against anyone who wants to be involved with the extremist group," a police officer said. The spiritual leader of Jamaat-ul-Mujahideen, Shayek Abdur Rahman, and the head of the banned Jagrata Muslim Janata Bangladesh, Siddikul Islam Bangla Bhai, remain at large.