In a video posted on Twitter Tuesday, Ciani said a group of gunmen went to his sister's medical clinic and killed her in front of her children and mother.
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Ciani was calling on the Mexican president and other top officials to do something and help put an end to the violence.
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"He killed her with three shots...We can't keep living like this. I am asking you to resolve this problem for the security of Mexico," Ciani pleaded in Spanish.