According to Press TV, paramilitary forces and police in riot gear as well as ambulances and dozens of police vehicles were deployed in the capital, garrison city of Rawalpindi, southern port city of Karachi and eastern city of Lahore on Monday.
Qadri, who assassinated Salmaan Taseer, the former governor of the country's province of Punjab, was executed at 04:30 local time (23:30 GMT) at Adiala jail in Rawalpindi on Monday, after all his petitions and mercy appeals were rejected.
The execution has triggered protests in some cities. Most schools closed down in Islamabad and the nearby city of Rawalpindi in fear of violence by supporters of the executed former police officer. In some places, the protesters demanded the store owners close their businesses and Qadri's supporters blocked roads and burned tires.
Qadri shot Salman Taseer-- the high-profile member of the Pakistan People's Party (PPP) and Punjab Governor -- 28 times while guarding him in an Islamabad market in early 2011.