WASHINGTON (AP) -- Defense Secretary Leon Panetta is condemning what he calls the murder of two American military officers in Afghanistan's capital.
Pentagon press secretary George Little says in a written statement that Panetta believes Saturday's killings in Kabul are unacceptable.
The nationality of the gunman hasn't been confirmed. The Taliban claimed responsibility for the attack inside a heavily guarded government building, saying it was retaliation for the burning of Qurans on a U.S. military base in Afghanistan.
Little says Panetta received a telephone call from his Afghan counterpart, who offered his condolences and apologized for the incident.
Little says Panetta urged the Afghan government to take "decisive action" to protect coalition forces and to curtail violence after a week of unrest sparked by outrage over the burning of the Muslim holy books.