(UPDATES) FOUR Philippine policemen were found guilty on Tuesday of killing a father and son, court officials said, in a rare case of law enforcement officers being prosecuted for taking part in former president Rodrigo Duterte's deadly drug war.

The low-ranking officers were all sentenced to up to 10 years in prison for the shooting deaths of the two victims at a Manila slum during an antidrug police operation in 2016, Manila Regional Trial Court Judge Rowena Alejandria said in her written verdict that was read in court on Tuesday.