Jagtar Singh Johal, 30, was among five people arrested in connection with targeted killings, including that of RSS leader Jagdish Gagneja. The Scottish-bornSikh was arrested from Jalandhar, where he had come for his wedding last month.
The Aam Aadmi Party (AAP) and the Shiromani Akali Dal (SAD) have raised doubts over Punjab Police's claims about Johal's involvement in targeted killings. They have asked the state government to provide evidence to prove his complicity.
Describing those opposing Johal's arrest as "working against the interests of India, particularly Punjab," Singh said such elements were trying to disturb peace and harmony in the state.
"The whole issue was being sought to be politicised by certain pro-Khalistani elements and it was unfortunate that Punjab's own leaders were adding their voice to these elements," he said.
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"Radical elements based in Britain and some other countries had launched a false and slanderous orchestrated media campaign against the Punjab government/Punjab Police."
There was a well-planned conspiracy at work in this whole affair, the Punjab chief minister said in a statement.
He said his government was more concerned about maintaining Punjab's peace, rather than worrying about perceived embarrassment at the hands of foreign forces, which had no stake in India's security or development.
Singh said India never interfered in other countries' policing and legal matters, even if an Indian citizen were involved, and expected the same respect and diplomatic propriety to be followed by other nations.