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The Mexican navy says it has seized nearly six tonnes of cocaine found inside a 10m-long (31ft) makeshift submarine in the Pacific Ocean.
A naval spokesman said they had known about such submarines but this was the first time they had seen one. US intelligence helped in the operation.
Four Colombian crew members have been taken into custody.
The submarine had been carrying its cargo from Colombia towards the coast of Mexico when it was intercepted on Wednesday. It took the navy two days to tow it to shore.
The cocaine was inside sealed packages on board the sub
The US Homeland Security Secretary, Michael Chertoff, revealed on Friday that US intelligence had led Mexican forces to the submarine.
"We shared information with the Mexican navy, but the Mexican navy acted alone. It was actually their seizure, their marines, their helicopters and naval vessels that captured the submarine," Mr Chertoff said on a visit to Mexico City.
Mexican Vice-Admiral Jose Maria Ortegon Cisneros said that the drugs were in 257 packages wrapped in black plastic.
He said that the submarine was equipped with a global positioning system (GPS) and a compass.
"This is going to force us to intensify our aerial surveillance, because the freeboard (distance from the deck to the water) of this sub is not detected by radars or any type of electronic detection device," he told reporters in Salina Cruz in the state of Oaxaca.
"Four people were detained. Based on their statements they say they left from Colombia. They did not specify from what port. Three of them are from Buenaventura and the other from a town in the centre of Colombia."
He added that the navy had stepped up patrols in the area where the sub was seized.
The crew claimed to be fishermen forced by drug cartels to move the cargo, said Vice Admiral Cisneros. They said they had sailed from Colombia about a week ago.