BOGOTÁ, Colombia — Three officers were killed in a bomb blast late Friday at a police station in southwestern Colombia as thousands gathered across the country for renewed protests of President Ivan Duque’s government.

Ten officers were also injured in the explosion, which occurred in the town of Santander de Quilichao in Cauca province, a hot spot for drug trafficking, police officials said.

No group took immediate responsibility for the explosion.

The explosion came a day after three people were killed in Valle del Cauca province when a protest there grew violent and led to looting.

Demonstrations were called across the country this week to protest government corruption and the murder of human rights activists.