I would guess, I would surmise that some of the more spectacular bombings are done by al Qaeda suiciders.
God told me to strike at Al Qaeda and I struck them, and then he instructed me to strike at Saddam, which I did.
And after September the 11th, the United States Congress also granted me additional authority to use military force against al Qaeda. . . .
USA have got a comprehensive strategy to not only chase down the Al Qaida, wherever it exists - but to make sure that countries that harbor terrorists are held to account.