They were leaving a social event in the south-western department of Huila when their vehicle hit a road mine. They were then shot dead in the ambush, a police spokesperson said. It is the worst attack on security forces since former guerrilla Gustavo Petro was sworn in as Colombia's first left-wing president less than a month ago According to the national police and attorney general's office, three of the officers who were killed were aged 20 or younger. Mr Petro condemned the attack, calling it "a clear act of sabotage against peace" in a tweet. Late on Friday he travelled...