KABUL, Afghanistan — U.S. officials say the Haqqani (hah-KAH'-nee) insurgent network, which has ties to al-Qaida, is suspected of being behind some "insider" attacks by Afghan forces. Those attacks have killed or wounded more than 130 American and allied troops this year.

Until now, officials had said the attacks seemed to stem from personal grievances against the allies or from Taliban infiltration.

The officials had not previously cited suspicion of a Haqqani link.

The Taliban publicly claims to be orchestrating the attacks.

The officials said there is no hard evidence of a Haqqani tie to specific incidents but attack patterns point in that direction.

The officials spoke on condition of anonymity in order to discuss inferences drawn from internal U.S. military analyses. They were not authorized to make the comments publicly.