* How masked gunmen killed Hardeep Singh Nijjar The Washington Post
* India warns citizens in Canada to be cautious bbc.com
* Tensions escalate between Canada and India over killing of outspoken Sikh leader PBS NewsHour
* If India killed a Canadian Sikh, Trudeau and other Liberal PMs are at fault Al Jazeera English
* Who Killed Hardeep Singh Nijjar? - WSJ The Wall Street Journal
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