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Although Sikhs and Hindus do sometimes commit such murders, honor killings, both worldwide and in the West, are mainly Muslim-on-Muslim crimes. In this study, worldwide, 91 percent of perpetrators were Muslims. In North America, most killers (84 percent) were Muslims, with only a few Sikhs and even fewer Hindus perpetrating honor killings; in Europe, Muslims comprised an even larger majority at 96 percent while Sikhs were a tiny percentage. In Muslim countries, obviously almost all the perpetrators were Muslims. With only two exceptions, the victims were all members of the same religious group as their murderers.
http://wikiislam.net/wiki/Muslim_Statis ... r_Violence