The Special Court for Bomb Blast Cases, Poonammallee convicted Zakir Hussain alias Zakir, Towfiq alias Yasir, Nizamuddin and Abdul Quadir alias Mohammed Abdul Quadir and sentenced them to 10 years RI.
If they failed to pay the fine they would each attract an additional year of imprisonment, the court said.
On November 29, 2002, the police had apprehended Zakir Hussain and Towfiq with gelatin sticks and detonators.
Later, the probe was transferred to Special Investigation Division of the CB-CID.