Americans in Islamabad, Pakistan are being warned to stay away from government buildings and several major hotels in the city because of the threat of terrorism.

The U.S. Embassy in Islamabad on Sunday cited a general threat alert from the Ministry Interior of the government of Pakistan that warned of terrorist attacks aimed at certain government buildings downtown and several hotels and motels popular with visitors, including the Marriott, Holiday Inn, Best Western and the Margalla Motel.

Local media has reported thousands of Pakistanis, joined by U.S. anti-war activists, headed Sunday morning toward Pakistan's volatile tribal region to protest American drone strikes.

The embassy warning did not specify that the threats were related to the drone protests.