Pakistan's capital was under strict security lockdown starting October 14 ahead of the arrival of Chinese Premier Li Qiang for a four-day bilateral visit and a heads-of-government gathering of the Shanghai Cooperation Organization (SCO) this week.
The government has announced a three-day public holiday in Islamabad, with schools and businesses shut, and large contingents of police and paramilitary forces deployed.
Pakistan Army troops will be responsible for the security of the capital's Red Zone, which will house most of the meetings and is also home to parliament and a diplomatic enclave, according to the Interior Ministry.
The threat alert has been high in the South Asian nation ahead of the SCO summit meeting, especially after the killing of two Chinese engineers and the shooting deaths of 21 miners.