Zimbabwean public sector doctors went on strike on Tuesday for the second time in less than a year to demand a further salary increase amid soaring living costs, as President Emmerson Mnangagwa’s government struggles with a deteriorating economy.

Zimbabwe is mired in its worst economic crisis in a decade, with triple-digit inflation, rolling power cuts and shortages of U.S. dollars, basic goods, medicines and fuel that have revived memories of the hyperinflation that forced it to ditch its currency in 2009.

Mnangagwa’s government has proposed big pay rises for doctors and other public sector workers in an attempt to avert crippling strikes. Police have banned a series of protests called by the opposition in major cities and have used tear gas and water cannon to disperse demonstrators.

The main unions representing doctors and teachers, who make up the bulk of public service workers, said they had rejected the government’s salary offers, which would see the lowest paid worker earning 1,023 Zimbabwe dollars ($90.45) a month.

The doctors accepted their 60% pay increase but said it was not sufficient to avert the strike action. The teachers are not currently on strike.

The doctors are looking for another 401% pay hike that they want indexed to the U.S. dollar.

($1 = 11.31 Zimbabwe dollars)