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Update: All lanes are now open.

A fatal collision near Casa Grande has shut down parts of I-10 West. 

The incident, which occurred at milepost 186 by State Route 387, has caused about a five mile delay in traffic, according to the Arizona Department of Public Transportation. 

An expected time to re-open the roadways has not been determined yet.

Drivers are encouraged to take the McCartney Road exit 190 and head west to State Route 387 and then continue north to I-10 to avoid the accident.