BOSTON (CBS) – State Police are upset no one called them about a dangerous incident on the Southeast Expressway that people photographed, but didn’t report.

Troopers posted a photo of the stunt on their Facebook page Wednesday.

It shows two teens riding on the back of a tractor-trailer Tuesday afternoon on I-93 in Dorchester.

“We would like to remind the public how unsafe and illegal this is. This photograph and other similar photographs are circulating regarding this incident. The Massachusetts State Police did not receive any phone calls regarding this incident as it was occurring, yet several drivers took photographs of it,” State Police said in the Facebook statement.

“Obviously, this is extremely stupid and reckless. (Whether) it was a prank or they were looking to hitch a ride, we urge them not to do this. And we urge the public to call 911 on their cell phones immediately if they see something like this,” State Police spokesman Dave Procopio told WBZ-TV.

“We would have hoped someone would have called us so we could have sent a cruiser.”

The person that took the photo told WBZ-TV’s Jim Armstrong that other drivers signaled to the truck driver that the teens were hiding on the back of his truck and he was able to stop.

If you have any information about the incident, please contact State Police.