"I call upon the responsible officers of Rangers, those commanding them and security institutions of the country to begin an operation against those who mercilessly killed 14 people during Model Town clashes in Lahore," he said, addressing his workers outside his residence in Model Town here.
About 4,000 workers of Qadri's Pakistan Awami Tehreek (PAT) thronged the Lahore airport to greet him upon arrival.
In addition to the 150-strong PAT youth force, heavy contingent of the Punjab police was deployed to provide security to Qadri.
Imran's sit-in however lasted for four months as he was demanding Sharif's resignation over rigging allegations in May 2013 general elections while Qadri sought justice for the killing of his 14 supporters and the Premier and his brother Shahbaz Sharif responsible for it.
Qadri left for Canada last October amid reports that he had struck a deal with the Sharif-led PML-N government.
Qadri, however, had denied such reports.
Qadri said he was determined not to spare those involved in the killing of his supporters.
He said the plot of the massacre was designed at the Prime Minister's House and accused both Sharif and Punjab Chief Minister Shahbaz for "supervising the killing".
A murder case was registered against Sharif, Shahbaz, Interior Minister Chaudhry Nisar and other cabinet members for their alleged involvement in the killing of Qadri's supporters in a police raid in Model Town on Jun 17, 2014.
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