Six people have been killed in Sudan's troubled Darfur region during a protest against high prices.

Officials say the deaths occurred Tuesday in the regional capital Nyala, but they did not say how. Several other people were injured.

Earlier, witnesses said police fired tear gas at the demonstrators who burned tires and called for “the fall of the regime.” Scattered anti-government protests across Sudan have been held since last month.

The U.N. Security Council on Tuesday extended the mandate of peacekeepers in the Darfur region for another year, but is slightly cutting the size of the force.

The new resolution lowers the number of the troops by 3 percent to about 16,200 troops, and reduces the number of police by 13 percent to about 4,700.

The Security Council renewed its call for productive peace talks in Darfur, where rebels have been fighting Sudan's central government since 2003.