Vehicles in and around the business hub were thoroughly checked, they said.
The forces took position on roof tops of buildings and other vantage points in the city. They also carried sniper guns.
Forces later appeared on the bund along the Jehlum banks, Lal chowk and frisked people there as well.
The searches ended peacefully with no reports of any arrests.
Here is the story in pictures taken by photo journalist Shah Jehangir