Pakistan's eight-wicket defeat to the tournament hosts Sri Lanka is being investigated by the ICC's anti-corruption unit (ACU). As yet, no players from either side have been interviewed by the ACU over the incident.
A statement from the ICC said the ACU would watch tapes of every match in the 12-team tournament as part of its security plan.
"Specifically, it has reviewed a number of incidents that took place in the opening match of the tournament between Sri Lanka and Pakistan on September 12," the statement added.
Electing to bat first, Pakistan were bowled out for 200 with two deliveries to spare in the tournament opener. Sri Lanka reached the victory target with ease thanks to a century from Sanath Jayasuriya.
The controversy is the latest issue to blight the Champions Trophy which endured a stormy build-up after a heated sponsorship row between the ICC and a number of the competing nations.
