The Afghan government said it disagrees with the U.S. assessment that Islamic State militants were behind an attack on a maternity ward that killed two dozen, including babies.

The disagreement comes as Afghan security forces launch a new offensive against the Taliban, which it claims was behind the Tuesday attack on the Kabul maternity ward. Three gunmen disguised as police officers stormed the maternity ward, which was run by Doctors Without Borders, and were killed after a lengthy gun battle with Afghan forces.