Semi crash on I-65 exit ramp spills mail across roadway in NW Indiana

A semi carrying U.S. mail crashed on I-65 on Wednesday morning, spilling packages across the interstate ahead of the morning rush in northwest Indiana.

What we know:

The crash happened around 4:30 a.m. on the ramp from northbound I-65 to eastbound I80/94.

According to Indiana State Police, the semi-trailer was loaded with U.S. mail and "completely split open" when it crashed.

The northbound lanes of I-65 have been shut down for an investigation. Traffic is being diverted onto westbound I-94.

Clean-up could take roughly four hours before the roadway is reopened, officials said.

What we don't know:

No details have been given on what caused the crash. No injuries have been reported.

This story is developing. Check back for updates.