WASHINGTON - Militants attacked a US compound in Kabul that is believed to include a major CIA office for Afghanistan, according to news reports and official sources.

The Central Intelligence Agency declined to comment but a US government source acknowledged the building targeted in the attack, considered part of the US embassy compound in Kabul, likely contained CIA offices.

The BBC reported gunfire and a blast were heard on Sunday evening from the compound. It said a US official confirmed there was an attack on a facility previously known as the Ariana hotel.

A US official confirmed to Reuters an attack was made against a facility used by US officials in Kabul, saying that the situation is fluid and the investigation continues.

Two weeks ago, militants launched an assault against the US embassy and NATO headquarters in Kabul. US officials blamed those attacks on the Haqqani network, a group of Afghan militants based in Pakistan's tribal areas.

US officials said there was intelligence, including intercepted phone calls, suggesting those attackers were in communication with people connected to Pakistan's principal spy agency, the Inter-Services Intelligence directorate.

Pakistani officials strongly denied any ISI connection to the earlier Kabul attacks. US officials did not immediately respond to questions about who might be behind the latest attack.