At least four people have been killed by unidentified gunmen during protests over fuel subsidy cuts in Sudan, police officials say.
"Unknown shooters fired on demonstrations in Khartoum Bahri, Khartoum, and Omdurman" during protests on Friday, the police said in a statement carried by the official SUNA news agency on Saturday, adding, As a result of that, four civilians were killed."
The protests began on Monday when the government lifted fuel subsidies to raise revenue.
Seven people were killed on Wednesday in clashes with security forces in Khartoum and its sister city Omdurman.
The demonstrators burned vehicles in a hotel car park near Khartoums international airport, and a petrol station in the area was also set alight.
Security forces fired tear gas to disperse the demonstrators.
On Tuesday, protesters stormed and torched the offices of the ruling National Congress Party in Omdurman.
Human rights groups claim that at least 50 people have been shot dead by security forces during the clashes.
Sudans Education Ministry announced that schools in the capital would remain closed until the end of the month.
Sudan lost billions of dollars in oil revenues after South Sudan gained independence two years ago, taking with it some 75 percent of crude production of the formerly united country.
Sudan has been plagued by running inflation and a weakening currency since then.