A new wave of protests is underway after Monday’s approval of disputed October elections.

At least 21 people have been killed in unrest since Mozambique’s Supreme Court confirmed the victory of the ruling FRELIMO party. disputed electionsaid the interior minister.

Interior Minister Pascoal Ronda told a news conference on Tuesday that at least two police officers were among the dead.

He said there had been “236 serious acts of violence” in the Portuguese-speaking African country since Monday, in which at least 25 people, including 13 police officers, were injured.

The protests began after Frelimo was suppressed. Confirmed The Constitutional Council selects the winner. Protesters and opposition groups say the Oct. 9 vote was rigged.

Ronda told public broadcaster TVM that 78 people had been arrested so far and security measures had been tightened across the country. “The armed forces will increase their presence at key locations,” he said.

The opposition and election observers have repeatedly accused Frelimo of vote-rigging. It denies the accusations.

Supporters of opposition candidate Venancio Mondlane began protests on Monday night after the Supreme Court declared ruling party Daniel Chapo the winner of the presidential election.

Protesters have been accused of attacking and damaging police stations, gas stations, banks and other public facilities.

Al Jazeera’s Haru Mutasa, reporting from Maputo, said protesters burned tires and blocked roads.

“This is their way of shutting down Mozambique,” she said. “People say they are tired of years of corruption and unemployment.”

Mutasa said some young people were asking motorists for money to drive through places. “While these protests may have started because of the election results, it appears that some have tried to infiltrate them,” she said.

Mozambique has been rocked by violent protests since electoral authorities declared El Chapo, 47, the winner of the presidential election in late October.

More than 130 people have been killed since October 21, according to human rights and civil society groups, which have also accused Mozambican security forces of using excessive violence to suppress the protests.

Following the announcement by the Constitutional Council on Monday, Mondlane took to social media to ask his supporters to prepare for the “difficult days ahead”.

“History is made up of tough, rocky moments, but the truth is, we all will prevail,” Mondlane wrote on Facebook.