MANILA - Scores of holiday resorts on the Philippines' famous white-sand island Boracay have been given 2 months to clean up or face closure, officials said Wednesday, after President Rodrigo Duterte warned tourists were swimming in waters polluted by feces.

The outspoken Philippine leader last week blasted the tiny island's hotels, restaurants and other businesses, accusing them of dumping sewage directly into the sea and turning it into a "cesspool".

The Environment Ministry said a total of 300 businesses faced "evaluation" for sanitary or other offences on the 1,000-hectare (2,470-acre) island, of which 51 have already been handed official warnings for violating environmental regulations.

Many of these businesses are accused of using the island's drainage system to send untreated sewage into the sea, officials said.

"(The ministry) is giving them 2 months to comply with the law. Otherwise, we will close them," Environment Secretary Roy Cimatu said in a statement posted on his agency's website.

Officials will also investigate businesses that put up buildings in protected parts of the island.

Boracay, 308 kilometers (190 miles) south of Manila, is one of the Philippines' top tourist destinations, attracting some two million visitors each year.

It has some 500 tourism-related businesses, although most of the island's supplies have to be shipped in from nearby ports.

Tourism Secretary Wanda Teo said island needs a "massive clean-up", adding that the work was "a bitter pill that we have to swallow if we (are) to collectively save and sustain Boracay".

Local businesses said Duterte's remarks had yet to have a serious effect on visitor numbers.

But Nenette Graf, head of industry association the Boracay Foundation, said there had been "1 or 2 cancellations" since the issue came to light.

Local government official Rowen Aguirre conceded that inspectors had often found cases of resort violations concerning waste water discharge and expanding into "no-build" zones, but expressed optimism that the problems could be resolved.

"The term 'cesspool' is too strong. You just have to come here and see the situation for yourself," he told AFP.