Iran has extended a night-time traffic curfew to 330 lower-risk cities in an effort to sustain a recent fall in the number of new coronavirus infections and deaths, state television reported on Saturday.

Alireza Raisi, spokesman for the national coronavirus task force, said on state TV that a curfew running from 9 p.m. to 4 a.m., already in place in 108 so-called "orange" or medium-risk cities, will be extended to lower-risk "yellow" cities.

The curfew, during which there is a ban on the use of private cars to reduce the level of contacts between people, resulted in nearly 100,000 fines on one night in the past week.

The Health Ministry said 134 people had died of COVID-19 in the past 24 hours, the lowest since Sept. 13, taking total deaths to 54,574 in the Middle East's worst-affected country.

There were 5,760 new cases, the lowest since Oct. 22, bringing the total to 1,194,964.

Iran said on Thursday it had received approval from U.S. authorities to buy coronavirus vaccines from the World Health Organization-led COVAX alliance.

It did not say which vaccines it was buying.

The head of Iran's Red Crescent Society told state TV that, separately from the government, it was planning to import an unnamed Chinese vaccine. Asked about possible concerns over the drug's safety, Karim Hemmati said: "All imported vaccines and medicines undergo controls by (Iran's) Food and Drug Administration ... So there is no problem there."

In televised remarks on Saturday, President Hassan Rouhani reiterated Iran's complaint that U.S. sanctions had made it difficult to make payments for vaccines. "We arranged money from a bank to buy vaccines from COVAX but they said you need (U.S.) approval," he said.

Food and medicine are exempt from sanctions that Washington reimposed on Tehran, but the U.S. measures have deterred some foreign banks from processing financial transactions for Iran deals.