Three terrorists were killed and four others held in an encounter with the Counter Terrorism Department (CTD) in Machar Colony on Monday.
Addressing a press conference, the CTD officials said that the terrorists were planning to attack shrines and Imambargahs.
They said that indigenous bombs, hand grenades, Kalashnikovs and pistols.
The officials said that three facilitators of the accused, who managed the escape of dangerous terrorists from Central Jail, from Abbottabad.
They said that they had also arrested Muhammad Ashfaq, a member of the banned Lashkar-e-Jhangvi, who had confessed to having killed Kamran and Abbas Haider in 2013.