KHARTOUM, Sudan — Sudan’s pro-democracy leaders continued on Thursday to press a campaign of civil disobedience after a deadly military crackdown this week, but a show of force by government security officers across the capital, Khartoum, appeared to thwart new demonstrations.

At least 108 demonstrators have been killed and hundreds of others wounded since security forces stormed a protest camp in Khartoum on Monday. Pro-democracy groups have vowed to continue peaceful protests that gathered momentum after the ouster in April of President Omar Hassan al-Bashir until the ruling military council is removed and those responsible for the deaths this week are brought to justice.

Citing the crackdown, the African Union suspended Sudan from all union activities “with immediate effect.” The economic and development group said the suspension would last until Sudan’s military handed over power to a transitional civilian authority. The United Nations and Western governments have also condemned the violence.

The Health Ministry, which is controlled by the military, disputed the death toll, saying on Thursday that 61 people had died in the crackdown this week. Violent clashes have also erupted in other parts of Sudan, and protest leaders said there were attacks, including killings and rape, in 13 cities and towns perpetrated by security forces and the paramilitary Rapid Support Forces.