Detroit, Michigan-headquartered automaker General Motors (GM) has announced plans to invest $1 billion in a manufacturing plant in Mexico to build electric vehicles (EVs).

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Mexico City - The number of confirmed swine flu infections in Mexico climbed from 49 to 91, with eights deaths caused by the new strain, Mexican Health Minister Jose Angel Cordova said Wednesday night.

The latest figures came shortly after the World Health Organization (WHO) in Geneva raised the pandemic alert for swine flu by one level to phase 5.

Washington - US President Barack Obama said late Wednesday that there were no plans to close the country's border with Mexico despite a growing swine flu outbreak, but assured the public that his government was doing all it could to contain the threat.

Obama said closing the border was "akin to closing the barn door after the horses are out," as there were already nearly 100 cases confirmed in the United States, including one death.

Geneva - World Health Organization Director General Margaret Chan raised the pandemic alert for swine flu by one level to phase 5 Wednesday night in Geneva.

The declaration of Phase 5 is a strong signal that a pandemic is imminent. It is characterized by human-to-human spread of the virus into at least two countries in one WHO region.

"Based on an assessment of all available information and following several expert consultations, I have decided to raise the influenza pandemic alert from phase 4 to phase 5,," Chan announced at WHO headquarters.

Mexico City - Mexico City said Wednesday that it would compensate workers impacted by restrictions imposed to combat the outbreak of swine flu.

Those hospitalized would also be compensated, government officials said.

At least 159 people have died and 2,498 sickened in Mexico's flu outbreak - these include seven swine flu deaths and 49 confirmed infections from the new virus. Of these, 1,311 people remain in hospital, but most have not yet been identified as cases of swine flu.