A Canadian-born man authorities allege is one of the most dangerous pedophiles in the world, has been arrested by Mexican federal police in connection to a massive child pornography ring they say spanned Canada, the U.S. and Mexico.

Police surrounded Arthur Leland Sayler's home in Tijuana last week, a beachfront house they say he has lived in for the past 20 years.

They arrested Sayler and seized 15 hard drives they said contained more than 4 million videos of children involved in sex acts.

Mexican authorities told a San Diego news agency that Sayler crossed the Mexico-U.S. border almost daily and spent time in the American city repairing computers.

Mexican police also seized Sayler's truck, which has California licence plates.

"I'm worried for the children around here because there are a lot of children," Filiberto Gomez said in a Spanish-language TV interview shortly after the arrest.

Gomez, who lived near Sayler, said he seemed like a good neighbour who "minded his own business."

The OPP would not comment on Sayler's case.

Toronto police's child exploitation unit is normally notified about any child pornography cases that cross the Canadian border, however, they could not be reached for comment. Neither could the RCMP.

Sayler is currently in a federal prison in Mexico City.

It is unclear whether he will be extradited to the U.S. or Canada or face trial in Mexico.

Sayler's Canadian hometown is unknown.

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With files from Canadian Press

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