The Supreme Court has upheld the death sentence of an Islamist militant over fatal suicide blasts targeting secular activists 10 years ago, a prosecutor said on Thursday.Asaduzzaman Chowdhury, who is also known as Panir, was sentenced to death in 2008 for his role in the December 2005 bombings that killed eight people and injured 40 more.A Dhaka court sentenced Chowdhury and two others from the banned Jamayetul Mujahideen Bangladesh (JMB) to hang in February 2008 for the attack on the offices of two groups that organise secular music and drama performances.The group was banned after a series of bombings across the country in 2005, but has recently regrouped and is blamed for a spate of attacks on foreigners and religious minorities in Bangladesh.