The father of Sandeep Unnikrishnan, a NSG commando slain in the 2008 Mumbai terror attack, on Wednesday said Ajmal Amir Kasab's execution was a step in the right direction.

"It is not a late decision, and it is a step in the right direction. But a lot has to be done before perpetrators of the Mumbai attack are brought to justice (in Pakistan)," K Unnikrishnan told IANS over phone.

"I am extremely satisfied with the government decision. It has brought a sense of relief to those who lost their near and dear ones in that attack," he said.

Choking with emotion, Unnikrishnan refused to say anything more. "I don't know what (more) to say."

Sandeep Unnikrishnan, a major in the Indian Army, was attached to the Special Action Group of National Security Guard at the time of the Nov 26-29, 2008 attack in Mumbai.

He was killed by terrorists at the Taj Hotel in Mumbai.