Iranian President Hassan Rouhani on Saturday authorised the country's provinces to impose lockdowns wherever necessary to stem a rapid rise in coronavirus cases.

"We are forced to intensify regulations and supervisions," starting in the capital Tehran, Rouhani said in televised remarks.

He said government-run coronavirus task-force offices around the country would make recommendations on restrictions and whether to impose one-week lockdowns.

Iran's death toll from the coronavirus has surpassed 25,000 and identified cases on Friday totalled 439,882, according to the health ministry.

Iran's health officials have expressed alarm over a surge in infections, urging the country to respect health protocols to control the spread of the disease.