KABUL, Afghanistan — The suicide bomber who tried to assassinate Afghanistan’s powerful new intelligence chief came from Pakistan and the attack was organized with the help of a sophisticated foreign intelligence service, President Hamid Karzai said Saturday.

Mr. Karzai said he would ask for clarification from Pakistan’s president, when the two men meet later this month, on whether Pakistan’s intelligence service was involved in any way. He said he wanted Pakistan’s help in easing ordinary Afghans’ suspicions that Pakistani interests were behind the attack — if not directly organizing it, then at least providing help.

The audacious assassination attempt on Asadullah Khalid, who had been leading the National Directorate of Security since September, has taken out of action an important figure in the war against the insurgency. It took place on Thursday when an unidentified attacker smuggled a bomb into a meeting at a guesthouse in central Kabul with Mr. Khalid.

“We will be seeking a lot of clarifications from Pakistan because we know that this man who came in the name of a guest to meet with Asadullah Khan Khalid came from Pakistan,” Mr. Karzai said at a news conference at the presidential palace here. “We know that for a fact, it is clear.”