A family video showing two teenage sisters enjoying a rain shower on the lawn of their bungalow led to their deaths in Chilas, Pakistan, on Sunday night.
Five masked men barged into the house of retired police officer Rehmat Nabi and started firing, killing his wife and daughters, ages 15 and 16, the Pakistani news site Dawn.com reported.
The video was circulated in the area, and police believe the girls' stepbrother, Khutore, took their behavior as an "assault on the honor of his family" and tried to "restore the family's honor" by killing the girls, Dawn.com said.
Khutore escaped, and authorities do not know his whereabouts. Four of his friends were arrested, however, and they have confessed to the murders, a senior police official told Dawn.com. Charges have been brought against the stepbrother.
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