The US military says it has evidence elements within Pakistan's military intelligence, the ISI, continue to provide support for the Taleban.
Officials said that this support for militants had to end.
The chairman of the US Joint Chiefs of Staff said the ISI had links with militants on both Pakistan's borders with Afghanistan and India.
US President Barack Obama has announced a new strategy for the "increasingly perilous" situation in Afghanistan.
Nato supplies terminal attacked: Rocket strike on facility in Peshawar follows mosque bombing that killed nearly 50 people. Al Jazeera