A high-ranking official told Cali on Monday that 10 police officers were investigating which allow civilians to shoot demonstrators in Cali while the prosecutor’s office linked three further murders to protests.

The Andes have witnessed over a month of protests against President Ivan Duque’s social and economic policies. The demonstrations were triggered by a tax reform now rejected.

Since the fiscal reform was withdrawn, the demands of protesters have expanded to include basic incomes, opportunities for youth, and an end to police violence.

Protests have been marked by violence. The Attorney General’s office on Monday said 20 deaths have been linked to demonstrations – three more than a previous tally – while rights groups report dozens more protesters have been killed by security forces.

Colombia’s third-largest city Cali, which has become an epicenter for protests, once more saw bloodshed on Friday with civilians and even an off-duty agent of the attorney general’s office shooting at demonstrators, the attorney general said.

An investigation has been launched to identify those who broke the law in Cali, General Jorge Luis Vargas, Director of Colombia’s National Police, said on Monday, adding that information concerning officers who may have broken the law or not performed their duties has been sent to the military justice unit.

Over the weekend Cali Mayor Jorge Ivan Ospina reported more than a dozen violent deaths took place in the city on Friday and reported armed men shooting at demonstrators in the presence of the police.

The United Nations High Commissioner for Human Rights, Michelle Bachelet, on Sunday called for those responsible for the violence in Cali to be held accountable.