Manila, May 6 -- Calls for accountability intensified Tuesday as Senators Sherwin Gatchalian and Francis Tolentino pressed for a deeper investigation into a Makati-based public relations firm allegedly operating a China-backed troll farm.

Gatchalian urged the National Bureau of Investigation, Department of Justice and National Security Council to pursue a full-scale probe into the reported activities of InfinitUs Marketing Solutions, Inc. (IMSI).

"If proven true, those involved should be prosecuted to the fullest extent of the law, including charges of treason and other serious criminal offenses," Gatchalian said in a news release.

"Panagutin at kasuhan ang mga nagpapakalat ng kasinungalingan at kabaluktutan para sa pansariling interes...