Three people from Austell were killed in Marietta on Tuesday morning after the SUV they were in was hit by a tractor-trailer on I-75, police said.

Quatrina Porter, 41, Eddie Murphy, 42, and Haamid Williams, 21, were all pronounced dead at the scene of the crash, according to Marietta police spokesman Officer Joshua Madison.

The incident happened about 5:40 a.m. in the northbound lanes of the interstate near the entrance ramp from North Marietta Parkway, the police department said in a statement.

Porter was behind the wheel of a 2009 Nissan Rogue that was stopped in the middle of the road, Madison said. It is not clear why the Nissan stopped, he added.

At some point, a tractor-trailer smashed into the stopped SUV, Madison said. The driver of the tractor-trailer, identified by police as 52-year-old Linder Rice, was not hurt in the crash, Madison said.

An investigation is ongoing.