Four of the 12 people wounded in the weekend bombing of an Islamabad restaurant are U.S. FBI agents, the bureau confirmed Sunday.

The attack occurred Saturday when a bomb was hurled over a wall surrounding the Luna Caprese restaurant, an outdoor cafe frequented by Westerners, journalists and diplomats.

Four FBI personnel were "slightly injured" in the blast, FBI Special Agent Richard Kolko said Sunday in a written statement.

In addition to wounding the agents, the explosion killed a Turkish woman and wounded a fifth American, three Pakistanis, a person from the United Kingdom and someone from Japan, authorities said.

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A high-ranking federal source had earlier told CNN that the agents' wounds included deep lacerations, concussions and fractures.

The four, who were eating dinner together at the time of the attack, were not believed to have been targeted, the source added.

An air ambulance took the agents to a hospital.

Government officials have not said who they believe is responsible for Saturday's attack, but they suspect al Qaeda and Taliban-linked militants from Pakistan's tribal region, who have carried out similar attacks in the past.

An FBI spokesman in Washington had no comment, but National Security Council spokesman Gordon Johndroe told CNN that President Bush "appreciates the hard and dangerous work that U.S. officials engage in around the world, and our thoughts are with them and their families as they recover from this attack."

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