Hundreds of buildings were damaged or looted, including schools and hospitals, in a wave of unrest after Daniel Chapo was confirmed as the winner of the presidential election.

Around 125 people have been killed in three days of violent clashes across Mozambique amid opposition-led protests over the presidential election results, a non-governmental organisation said Thursday.

UN Secretary-General Antonio Guterres expressed concern about the unrest in Mozambique, his associate spokesperson said Thursday. "The Secretary-General is concerned about the post-election violence, which has resulted in loss of lives and the destruction of public and private property," Stephanie Tremblay told reporters.

More than 1,500 prisoners escaped from a Maputo prison Wednesday, taking advantage of the third day of unrest triggered by the controversial confirmation of the long-ruling Frelimo party as the winner of recent elections.

At least 21 people have been killed in unrest after Mozambique's top court on Monday confirmed long-ruling party Frelimo's victory in the election, the country's interior minister said late on Tuesday.

The prisoners took advantage of ongoing political unrest triggered by disputed poll results, police say.

A ruling on Monday confirming that Daniel Chapo had won a disputed election has sparked protests and violence.

A prison riot in Mozambique's capital Maputo left 33 people dead and 15 injured, the country's police general commander Bernardino Rafael said on Wednesday, as civil unrest linked to October's disputed election continues.