Pakistan has restricted travel for U.S. diplomats in the country, the State Department said, CNN informs. The U.S. ambassador to Pakistan, Cameron Munter, was temporarily detained at the Islamabad airport last week as he tried to fly from Islamabad to Karachi. State Department deputy spokesman Mark Toner said Munter was not carrying a certificate that Pakistani authorities now are requiring for American diplomats to travel within Pakistan. Ambassador Munter “returned to Islamabad without incident,” Toner said. Toner said the Pakistani government informed the U.S. of the restrictions last week. Asked why the restrictions were put in place he said, “You’ll have to ask the government of Pakistan.” In a separate incident last week U.S. diplomats were prevented from traveling between Islamabad and Peshawar.