br pFour officers died when their helicopter was reportedly shot down over the City of God favela in Rio de Janeiro during a police operation on Saturday evening, November 19.ppAccording to local reportsa, the chopper was supporting a ground operation against local drug traffickers when it was hit by an unidentified projectile. Earlier in the day fighting with criminal gangs closed the main Yellow Linea highway for 40 minutes.pbr pIt is not the first time that a police helicopter was shot down in the city. In a similar incident in 2009a, drug traffickers downed a helicopter in another Rio favela killing three policemen.