BBC News with David Austin.

President Barack Obama has welcomed BP's success in stopping the flow of oil from its leaking well in the Gulf of Mexico.

He

emphasize

d that whatever the next move was, it would be governed by science and that an enormous clear-up operation was still needed.

"The new cap is good news. Either we will be able to use it to stop the flow, or we will be able to use it to capture almost all of the oil until the relief well is done. But we are not going to know

for certain

which approach

makes sense

until additional data is in. And all the American people should

rest assured

that all of these decisions will be based on the science and what's best for the people of the Gulf."

Earlier, BP's share price rose sharply following its success in stopping the flow of oil for the first time in nearly three months of trying.

The World Health Organization has strongly criticized a report by the campaign group Amnesty International that condemned North Korea's health system.

The director general of the WHO Margaret Chan said the report was largely based on evidence from people who left the country several years ago. Imogen Foulkes reports.

Last April, WHO director general Margaret Chan returned from an official visit to North Korea to describe the health system there as the envy of many developing nations, with no shortage of doctors or nurses.