Demonstrators have set up roadblocks in six of the country's 25 departments. Officials say there are 53 separate roadblocks.
Peru has announced a curfew in the southern Puno region in a bid to suppress violent protests, a day after 18 people were killed in clashes between demonstrators and security forces.
Prime Minister Alberto Otarola said on Tuesday the three-day nighttime curfew would run from 8:00 pm to 4:00 am [local time.]
It comes after the death toll in a month of protests against the ousting of ex-president Pedro Castillo rose to 40, including the 18 people killed on Monday night.
The Puno region that borders Bolivia and is home to many Aymara Indigenous people has become the epicentre of the protest movement led by Castillo supporters.
Overnight, protesters looted shops and attacked police vehicles in the region.
Most of the bloodshed there took place when protesters tried to storm the airport in the city of Juliaca that was being guarded by security forces.
Fourteen people were killed, many having suffered gunshot wounds, according to an official at a Juliaca hospital.
Three more people died during the ransacking of a shopping centre in Juliaca, while the last known victim was a police officer who the United Nations said died after his vehicle was set on fire.
READ MORE: Peru: More than a dozen dead in anti-government protests
Government defends force against 'coup'
The government has defended the actions of the security forces in Juliaca, claiming those guarding the airport faced down an organised attempted "coup" by thousands of demonstrators.
But UN Human Rights Office spokesperson Marta Hurtado called on authorities "to carry out prompt, impartial and effective investigations into the deaths and injuries, holding those responsible to account and ensuring victims receive access to justice and redress."
Protests erupted a month ago when leftist Castillo — who was facing several graft investigations — was forced from office and arrested on charges of rebellion after attempting to dissolve parliament and rule by decree.
Tension had since been mounting in the cities of Puno and Juliaca, where a week-long general strike has forced businesses to close.
Demonstrators have set up roadblocks in six of the country's 25 departments. Officials say there are 53 separate roadblocks.
READ MORE: Peru protesters clash with police in airport takeover bid
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