The United States CIA drone programme that began in 2004 against militants in Pakistan has reported just four civilian deaths in 2013, the lowest since its launch.
The Bureau of Investigative Journalism, a British-based organization, said that increased scrutiny, political pressure and a sharp drop in the number of strikes may have helped cut civilian casualties, the Nation reports.
According to the report, the drones used to attack mainly in remote northwestern areas of Pakistan killed altogether 112-193 people in 2013.
More precise technology to target one room in a building has possibly brought that change.