BRISBANE, AUSTRALIA - Five Canadian nationals and an Australian-New Zealand dual citizen have been arrested in Australia for allegedly smuggling 135 kilograms of cocaine from Canada concealed in computer monitors, police said Thursday. 

The men were also charged with smuggling 120,000 ecstasy tablets found by customs officials in the same shipping container of computer equipment at the eastern coast port city Brisbane on Sept.  8, police said in a statement. 

Police described the seizure as the fifth-largest of cocaine in Australian history. 

The five Canadians were arrested at various locations across Brisbane and the Australian-New Zealand dual citizen in Sydney late Wednesday, police said. 

Australian Federal Police manager Mike Phelan said Canadian law-enforcement authorities were also investigating the shipment. 

"The AFP believes the people who have been arrested and charged in this operation were part of a highly sophisticated international drug-importation and distribution network," Mr.  Phelan said. 

"The AFP is currently liaising with its law-enforcement colleagues in Canada and conducting further inquiries in relation to this significant importation and the international syndicate allegedly responsible for it," he added. 

The six men appeared in courts in Brisbane and Sydney on Thursday.  They each face sentences of life imprisonment and the equivalent of more than $700,000 fines. 

One of the Canadians, #####, 29, of Abbotsford, B.C., was denied bail and did not enter pleas when be appeared in Brisbane court.  He was scheduled to appear again later Thursday with the other Canadians. 

His lawyer Peter Shields told the magistrate that Mr.  ### is a father of three who was on vacation in Australia. 

The Australian who was allegedly to take delivery of the drugs ######, 62, was ordered by a Sydney magistrate Thursday to remain in custody until his next court appearance Wednesday.  He entered no plea.