Activist Qyira Yusri said she received information that more than 20 participants were summoned by police following the convoy which took place in several parts of the country on Saturday (July 24).
She said among those summoned were Undi18 movement compatriot Tharma Pillai and Suara Rakyat Malaysia (Suaram) programme coordinator Mohammad Alshatri.
"Six protesters from today's Konvoi #LAWAN have been called to give their statements at IPD Brickfields tomorrow.
"Among them are @TharmaPillai and @matshatry," she tweeted on Saturday.
Sepang OCPD Asst Comm Wan Kamarul Azran Wan Yusof said police recorded the statements of three individuals on Sunday (July 25) in connection with the convoy.
"Three people have come to the Sepang police district headquarters to have their statements recorded.
"It is still early in the investigation," he said when contacted on Sunday.
The black flag convoy was organised by Secretariat Solidarity Rakyat to gear up for the #Lawan gathering scheduled for next Saturday (July 31).
The convoys were held concurrently all over the country including Batu Pahat in Johor, Ipoh in Perak, Temerloh in Pahang, and Kuala Lumpur.
On Friday, Dang Wangi OCPD Asst Comm Mohamad Zainal Abdullah reminded the public not to be involved in the convoy.
"Any gathering or social activity is prohibited as the movement control order is still in place.
"We will take stern action against any participant based on existing laws, including issuing compound notices," he had said.