Police Chief Tom Ryff's explanation, via the Arizona Republic:
"I have determined that out of sensitivity, respect and support for all sides of an important debate taking place all across our great country, it is necessary to proactively postpone this year's race," Ryff said.
When the annual event was named three years ago, the events taking place today couldn't have been predicted, Ryff said, adding that the department doesn't want the name of the event to misconstrue intentions.
Image via FOX 10
H/t to David