The Joint Investigation Team (JIT) decided to summon ex-PM Imran Khan in connection with the Jinnah House attack and arson.
According to sources, the JIT will issue a notice to Imran Khan.
The details of Zaman Park contacts have already been obtained, the insiders added.
The Pakistan Tehreek-e-Insaf (PTI) activists took to the streets to vent their spleen over the arrest of Imran Khan in a corruption case on May 9.
The PTI activists attacked public property, state assets and sensitive installations across the country. They also stormed GHQ in Rawalpindi, Jinnah House in Lahore and Radio Pakistan in Peshawar.
Innocent people lost their lives and the riots left a trail of destruction.
The authorities have launched a hunt for the culprits and made many arrests while investigations are on.