Karim was studying in a Karachi madrassa for the last two years. The police also released a pre-recorded video statement left behind by the bomber. Karim said in the statement that he was acting on his own will and nobody forced him to do so.

In the video, Karim asked his family members to pray for him and assured them that he would surely go to heaven. He also asked his brother to prepare himself for a similar act.

Why did a young Bangladeshi Sunni Muslim kill a prominent fellow Shia Muslim?

The answer may be for the same reason Sunni extremists are literally butchering their fellow Shiite Muslims in Iraq.

While the world's attention remains focused on the conflict between Lebanon's Shiite militia Hezbullah and Israel, far more Shiite Muslims are being slaughtered by fellow Sunni Muslims in Iraq. While 15 days of conflict in Lebanon have led to the death of 600 Lebanese and 50 Israelis, more than 100 Shiite Muslims are being killed every day by the Sunni extremists in Iraq and Shiites are also retaliating by killing, albeit in much smaller numbers, Sunnis.

Although the Sunni minority lost their grip on power after the US invasion, they are now attacking the Shiites with a viciousness not seen before. Only yesterday (July 27), at the height of Israeli-Hezbullah air and rocket attacks which killed about 30 Lebanese and 9 Israelis, rocket and mortar attacks on a Shiite residential area in Baghdad killed at least 40.

A car bomb also exploded at the same time in the Shiite commercial district of Karadah, injuring more than 150. A statement posted on a Sunni extremist website claimed responsibility in the name of Al-Sahaba Soldiers, a Sunni extremist group. The statement said that the attack was "in response to Shiite crimes".

The killing of a Pakistani Shiite cleric by a young Bangladeshi Sunni extremist demonstrates that a war is going between the Shiite and Sunni sects.