Johal alias Jaggi was among five accused arrested in connection with the targeted killings, including that of RSS leader Jagdish Gagneja.
Terming the AAP's support for Johal as "disgraceful", Punjab BJP vice president Harjit Singh Grewal and state BJP secretary Vineet Joshi said, "It seems that the AAP is supporting Jagtar Singh Johal just for the sake of NRI funding, which is highly condemnable. The AAP is least worried about the impact of their actions on the peace and harmony of Punjab."
Lashing out at AAP leader Bhagwant Mann and Kanwar Sandhu, the BJP leaders asked them "how they could reach a conclusion that Johal was tortured by the police without hearing from the investigating agency."
Grewal and Joshi urged the AAP asking it to refrain from "playing politics" over issues of national security.
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"The Punjab Police achieved a success in nabbing anti- national elements by putting in a lot of hard work. The AAP leaders should have appreciated the police for its efforts rather than condemning it," they said.
The police had earlier this month claimed to have solved the mystery behind the attacks on RSS Shakhas and the firing on Amit Arora, a Ludhiana based Hindu leader. Five incidents of targeted killings had taken place between April 2016 and February 2017.
Johal, who got married last month, was apprehended from Jalandhar.