According to RT, the United States government has admitted to killing at least four US citizens since 2009. 

The admission came from US Attorney General Eric Holder. He stated that since 2009 four US citizens have been killed by drones in Yemen and Pakistan. Samir Khan, Anwar al-Awlaki and his teenage son were confirmed by Holder to have been killed in a strike in Yemen in 2011.

There was also confirmation that one more American, Jude Mohammed, was also killed.