I was wondering why this statement is not in the past tense.?

A summary of a PBS.org POV Feature Film "Whose Streets?" started with "When unarmed teenager Michael Brown is killed by police and left lying in the street for hours, it marks a breaking point for the residents of St. Louis. ..." Just wondering why its not in the past tense since this... show more A summary of a PBS.org POV Feature Film "Whose Streets?" started with

"When unarmed teenager Michael Brown is killed by police and left lying in the street for hours, it marks a breaking point for the residents of St. Louis. ..."

Just wondering why its not in the past tense since this statement is describing something that happened in the past.
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