MARTIN COUNTY, Fla. (CBS12) — A crash involving multiple fatalities and a tractor-trailer closed all northbound lanes of Interstate 95 in northern Martin County late Saturday, according to the Florida Highway Patrol and Martin County Sheriff’s Office.

The crash was reported around 11:05 p.m. near mile marker 113, just north of Martin Highway and about half a mile south of Becker Road. FHP’s live incident report listed a fatality crash at that location.

The sheriff’s office said Martin County Fire Rescue and FHP were at the scene. Northbound traffic was being diverted off I-95 at the Martin Highway exit, and drivers were urged to avoid the area and expect significant delays.

Authorities had not released the number or identities of those killed, the cause of the crash or details about other vehicles involved. FHP’s live incident feed showed “no roadblock” at the crash location, but that entry does not confirm all lanes had reopened.

This is a developing story; check back for updates.