The latest deaths include an 86-year-old American male with travel history from the United States and South Korea, the Philippines' Department of Health said in an advisory.
The other three are Filipinos, including the latest fatality. In total, 12 people have died from the virus in the country, according to the health department.
Domestic land, sea and air travel to and from Metro Manila is now restricted, while stringent measures to contain or prevent local transmission have been imposed in other parts of the Southeast Asian country.
Major shopping malls in Metro Manila, home to at least 12 million people, have heeded the authorities' call for a temporary partial closure to discourage people from leaving their homes, while a nighttime curfew will begin on Monday.
Supermarkets, pharmacies, banks, bookstores and hardware stores will be kept open, while restaurants could also operate but only for home deliveries, Trade Secretary Ramon Lopez said.
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