But Admiral Michael Mullen, the chairman of the Joint Chiefs of Staff, said there were limits to what the world's navies could do once a ship has been captured because national governments often preferred to pay pirates ransom.

"I'm stunned by the range of it, less so than I am the size," Mullen said of the seizure of the Sirius Star Sunday by armed men.

The huge, oil laden prize, which is three times the size of a US aircraft carrier, was some 450 miles east of Kenya when it was boarded, he said.

That is the farthest out at sea that a ship has been seized in the latest surge of piracies, according to Mullen.

The pirates, he said, are "very good at what they do. They're very well armed. Tactically, they are very good."

"And so, once they get to a point where they can board, it becomes very difficult to get them off, because, clearly, now they hold hostages.

"The question then becomes, well, what do you do about the hostages? And that's where the standoff is.

"That's a national question to ask based on the flag of the vessel. And the countries by and large have been paying the ransom that the pirates have asked," he said.

Mullen said the number of successful piracies have gone down, but the incidence of ship seizures were way up.

"It's got a lot of people's attention and is starting to have impact on the commercial side, which I know countries raise as a concern," he said.

"And so there's a lot more focus on this. It's a very serious issue. It's a growing issue. And we're going to continue to have to deal with it," he said.

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