Amnesty International says Sudanese authorities must guarantee the safety of protesters ahead of planned mass rallies and following a deadly military crackdown that has left more than 100 dead since early June.

The rights group released a statement Friday quoting its Secretary Genera, Kumi Naidoo, as saying: “The horrific unprovoked use of lethal and unnecessary force against peaceful protesters as witnessed in early June must not be repeated this Sunday, or ever again.”

The military took over the country after protests drove longtime autocratic president Omar al-Bashir from power in April. Negotiations with protesters over the transfer of power to civilians reached a deadlock following the clampdown on their sit-in.

Nationwide protests are planned for Sunday to mark 30 years since al-Bashir took over in a military coup.

More than 30 people died on June 3 as activists in the capital, Khartoum, turned prayers marking the Eid al-Fitr holiday into political protests.

At the time, Mohammed Yousef al-Mustafa of the Sudanese Professionals Association, which has spearheaded the protests, said demonstrations and civil disobedience would continue until the fall of the military council.

The movement wants the generals who took power to hand over authority to civilians.