HONG KONG -Panicky Hong Kong residents scooped noodles, rice, meat and toilet rolls into supermarket trolleys on Friday despite government assurances of ample supplies during an outbreak of a new coronavirus that has killed 637 people in mainland China.

Chinese-ruled Hong Kong has reported 25 cases of the fast-spreading virus and one of only two deaths outside mainland China. “Everyone’s snatching whatever they can get. I don’t even know what’s going on,” said a 72-year-old woman surnamed Li as she clutched two bags of toilet rolls.

The government has condemned “malicious rumors” about shortages which have led to panic buying “and even chaos”, while supermarkets have put limits on the amount of products, including antiseptics, that people can buy. But hundreds of shoppers thronged city supermarkets again on Friday, loading up their trolleys.

The health scare comes after months of anti-government protests in the former British colony over fears its special autonomy is being whittled away by Beijing, which denies interfering. Worry over the virus has led to new friction, with many people, particularly medical workers, demanding that the city government seal the border with the mainland.

Hong Kong has closed some cross-border links but has said completely sealing it would be inappropriate, impractical and discriminatory. On Saturday, Hong Kong will introduce quarantine for two weeks for all people arriving from the mainland, or who have been there during the last 14 days. Matthew Cheung, chief secretary for administration, said that Hong Kong people returning from the mainland must stay home for a fortnight or risk a HK$25,000 ($3,200) fine and 6 months’ jail.

Non-Hong Kong residents must stay in government isolation centers or hotel rooms for the same period, facing the same penalties. “Self discipline and having everybody in Hong Kong fighting...this infectious disease is the most important thing,” said Sophia Chan, the city’s health secretary.

Thousands of hospital workers who had been on strike this week to press the government to close the border voted to suspend their action on Friday night. They said they would continue to pressure the government for tighter measures, however.

City authorities said they were conducting checks for the virus on a quarantined cruise ship carrying some 3,600 people that docked in Hong Kong this week. Health officials are trying to trace people who had traveled on the ship, many of whom disembarked in Hong Kong in January.