The Minnesota State Patrol is investigating a crash on Interstate 94 at the Lowry Tunnel in Minneapolis that closed the highway down for most of Friday afternoon.

A semi-truck carrying ammunition crashed into the median wall and rolled over just before 11 a.m. while heading west into the tunnel, shearing a side from the semi-trailer and scattering debris into the eastbound lanes.

Hazardous materials aren’t allowed to be transported through the Lowry Tunnel, but a State Patrol spokesperson said this type of ammunition was allowed.

The eastbound lanes were back open about 90 minutes later, but crews worked for several more hours to clear wreckage from the westbound side of the tunnel. Westbound lanes were back open as of 4:30 p.m.

The driver is said to have non-life-threatening injuries, and no other vehicles were involved in the crash.

An interactive traffic map showing current conditions can be found below.