DENVER (KDVR) — Interstate 70 and U.S. 40 are closed in both directions west of the Denver metro area Wednesday morning due to a semitrailer that caught fire and started leaking hydrochloric acid.

According to the Jefferson County Sheriff’s Office in an 8:15 a.m. X post, both the interstate and the highway are closed between the Morrison exit to the Lookout Mountain exit. The Colorado State Patrol in a press release said the fire was reported around 7:50 a.m.

The sheriff’s office advised drivers to use alternate routes: eastbound drivers exit at Evergreen and go to U.S. 285; westbound drivers exit at C-470 or Colfax.

CSP said there was no crash, but it did confirm that reports show the truck was leaking hydrochloric acid.

According to the American Chemistry Society, hydrochloric acid naturally occurs in the human stomach to digest food but is also synthetically produced for a variety of industrial and commercial applications such as construction, material production, household cleaners, pool maintenance and food manufacturing.

The sheriff’s office said hazmat crews are responding and the Colorado State Patrol is leading the response.

The office advised people to avoid the area and said it’s unclear how long the roads will be closed.

The sheriff’s office also reported multiple additional semitrailer incidents around the closure area, including a second hazmat situation on Grapevine Road south of the closed part of the interstate as well as trucks stuck on the Lariat Loop on Lookout Mountain.