A Filipino journalist and his colleagues have won a Pulitzer Prize for their coverage of the Philippines’ “war on drugs.” Manuel Mogato, who has been a journalist in the Philippines for more than 30 years, won the Pulitzer Prize for International Reporting with his colleagues for their Reuters series titled “Duterte’s war”, the Philippine Daily Inquirer reported.

“It was a team effort. Everyone in the Manila bureau [of the Reuters news agency] did their job, but it was months of hard work and I admired the courage, strength and perseverance of the team to pursue the drugs-war story,” Mogato said.

The article series looks into the Philippine government’s campaign against illegal drugs and exposes the killings that have been part of it. The “drug war” began in June 2016, shortly after President Rodrigo Duterte assumed office.

The Pulitzer Prizes were established in 1917 and are awarded to those who have shown excellence in journalism and the arts.

According to the Philippine government, more than 4,000 suspects have been killed in anti-drug operations since July 2016.