Chaudhry Arshad Saeed Arain, a senior prisons official, said the executed men were brothers Muhammad Imran and Muhammad Luqman, convicted over the murder of a man in Islamabad in 1996; and Raheel Ahmed, who gunned down a man in 1994.
Pakistan unveiled a sweeping plan to curb militancy after Taliban attackers gunned down more than 150 people, most of them children, at an army-run school in Peshawar in December 2014.
A six-year moratorium on the death penalty was lifted and the constitution amended to allow military courts to try those accused of carrying out attacks.
The number of known executions worldwide rose more than 50 percent last year to at least 1,634, the highest figure recorded since 1989, Amnesty International said in a report Wednesday — with the surge largely fuelled by Iran, Pakistan and Saudi Arabia.
“Over the past year, Pakistan has vaulted to the number three spot for recorded state executions in the world,” Champa Patel, director of Amnesty’s South Asia office, told AFP.
Pakistan executed 326 people last year, Patel said.