The Supreme Court in Bangladesh says it is upholding the death sentence sagainst an Islamic group's leader and two of his accomplices found guilty in the 2004 grenade attack on a British envoy.

Defense lawyers representing Harkatul Jihad leader Mufti Abdul Hannan say they will appeal for a Supreme Court review of Wednesday's ruling, though such reviews are rare.

Hannan and the two others were found guilty of orchestrating the 2004 grenade attack against Bangladesh-born British High Commissioner Anwar Choudhury while he was visiting a popular Islamic shrine in the northeast city of Sylhet. Choudhury was unharmed, but the attack killed three police officers and wounded 70 others.