The United States should provide information about top militants in Pakistan, a government minister said on Thursday, as Washington stepped up pressure on Islamabad to go after Taliban leaders.

The United States, struggling to contain rising insurgent violence in Afghanistan, says top Islamist militants, including Afghan Taliban leader Mullah Mohammad Omar, are in Pakistan.

US ally Pakistan rejects that.

'They have given only apprehension that some of the Taliban like Mullah Omar and all that, they might be in Quetta,' Interior Minister Rehman Malik told reporters.

The United States says an Afghan Taliban shura, or leadership council, headed by Omar is centred in the southwestern Pakistani city of Quetta.