WATCH: Semi-truck crash closes southbound I-35W

The Minnesota State Patrol (MSP) said it is investigating a semi-truck rollover crash that closed part of Interstate 35W in Minneapolis Saturday morning. 

Authorities say the driver of the semi-truck is injured to an "unknown extent." 

Law enforcement has not said what lead up to the crash. 

MSP said the crash happened just before 7:30 a.m. on southbound I-35W at Interstate 94. 

The highway was closed from Washington Avenue to Portland Avenue while the crash was being cleaned up. The westbound I-94 ramp to I-35W was also closed.

I-94 and Hiawatha Avenue, or Highway 55, were used as alternative open routes. 

I-35W reopened to traffic around 10:10 a.m.