Parts of Indonesia lack oxygen supplies as the number of critically ill Covid-19 patients who need it increases, the nation’s pandemic response leader said on Monday, after dozens of sick people died at a public hospital that ran out of its central supply.

“Due to an increase of three to four times in the amount (of oxygen) needed, the distribution has been hampered,” said Luhut Binsar Pandjaitan, the coordinating maritime affairs and investment minister. The government is asking oxygen producers to dedicate their full supply to medical needs and will import it if needed, Pandjaitan said at a news conference.

The statement comes after health minister Budi Gunadi Sadikit said the government guaranteed oxygen supply for Covid-19 patients on June 25.

At least 63 Covid patients have died during treatment at Dr Sardjito General Hospital in Yogyakarta city.