The smuggling of 370 million dollars or 18.8 billion pesos that passed through the Ninoy Aquino International Airport (NAIA) is under investigation to determine if security personnel are involved, the Bureau of Customs (BOC) said.
Customs spokesman Vincent Philip Maronilla said the probe, including the checking of surveillance footage, will confirm if the suspects were escorted by police, military or airport security personnel.
Maronilla said the travellers caught came from Hong Kong, Taiwan, and South Korea.
Under Philippine law, travellers entering the country are expected to declare anything more than 10,000 dollars upon arrival.
Maronilla also said the government could revise customs declaration forms to arrest potential launderers.