Hong Kong - Hong Kong health officials said Sunday they had stepped up surveillance at border control points as more swine flu cases were reported in Mexico and the US. Airlines had been asked to broadcast health advice on all direct flights from affected areas and passengers with symptoms have been asked to report to officers on arrival, the city's Centre for Health Protection said.

Mexico City/Geneva  - A spreading lethal virus that has claimed 68 lives in Mexico and infected at least 11 people in the United States prompted the World Health Organisation (WHO) to send out a global alarm Saturday.

WHO officials raised the possibility of an emerging pandemic even as countries in the region, including Nicaragua, Colombia and Brazil, tightened airport controls over people and goods arriving from Mexico.

Mexico City  - The death toll from a spreading wave of influenza in Mexico has climbed to 81, Health Minister Jose Angel Cordova Villalobos said Saturday evening.

Twenty of the lethal infections have been definitively linked to the newly emerging strain of swine flu, he said. All told, 1,324 people have been admitted to hospital for examination.

In the United States, 11 non-lethal cases of a similar strain of influenza have been identified by the Centres for Disease Control, with tests pending on another 10 cases.

Washington/Geneva - The Geneva-based World Health Organization Saturday declared the outbreak of swine flu in Mexico and the United States a "public health emergency of international concern."At least 20 deaths in Mexico have been confirmed as swine flu, among a total of 60 deaths that have occurred there. Hundreds of more non-fatal cases have been reported, and schools, museums and other public places have been closed to prevent the spread.

In the United States, at least eight cases in Texas and California have been confirmed by the US Centres for Disease Control.

Washington - An illness that has affected abut 75 students at a private school in New York City is "likely" swine flu, said Thomas Frieden, the New York City health commissioner. The conclusion was reached after swabs were taken from nine students at St Francis Preparatory School in Queens on Friday.

The specimens were examined by the health department, which concluded they exhibited in Influenza A strain that was "likely" swine flu, Frieden said.

A confirmatory result was expected Sunday from the Centers for Disease Control in Atlanta, Georgia.

Tokyo - Japan began checking temperatures of passengers arriving from Mexico Saturday after a swine influenza outbreak killed more than 60 people in Mexico and infected at least eight in the United States. The Japanese government on Saturday began tightening health checks on travellers entering the country through Narita and Kansai airports directly from Mexico or via the United States.