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Salim and Ali Qawli

Hussain Jamil Qawli, left, holds a photograph of his 20-year-old son, Salim, and Muhammad Qawli holds a photograph of his 34-year-old brother, Ali. Salim and Ali Qawli were killed in a U.S. drone strike in Yemen in January, Human Rights Watch reports. Letta Tayler / Human Rights Watch