Update 10:45 p.m.
OPP say the highway has been re-opened.
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Original story:
OPP have tweeted out that a serious two-vehicle crash east of Mattawa at around 6:30 p.m. has closed Highway 17 between Klocks's Rd and Burritt Rd
The highway will be closed for some time say police.
No detours are available.
Baytoday will update as information becomes available.