Two top US military commanders discussed "militant network activities" and steps to improve cross-border security cooperation during their meetings with Pakistan Army chief Gen Ashfaq Parvez Kayani and other senior officials, American authorities said today. Gen James Mattis, head of the US Army's Central Command, and Gen John Allen, commander of the International Security Assistance Force in Afghanistan, had met Kayani and Joint Chiefs of Staff Committee Chairman Gen Khalid Shameem Wynne in the garrison city of Rawalpindi yesterday. Mattis and Allen discussed "a wide range of common security issues, (including) militant network activities and improving cross-border cooperation" during their interactions with the Pakistan military officials, said a statement from the US Embassy here. The US has for long been asking Pakistan to crack down on al-Qaeda and Taliban elements who shelter in the North Waziristan tribal region and carry out cross-border attacks in Afghanistan. Pakistan has so far refused to launch a military offensive in the region. This was the first high-level military contact between Pakistan and the US since a cross-border NATO air strike in the tribal belt bordering Afghanistan killed 24 Pakistani soldiers in November. The military officials met a day after Prime Minister Yousuf Raza Gilani held talks with US President Barack Obama on the margins of a nuclear security summit in Seoul. During his talks with Gilani, Obama called for a balanced approach to bilateral ties that would respect Pakistan's sovereignty while addressing the national security concerns of the US. MORE