GASTON COUNTY, N.C. -- Police say seven people were hospitalized following a multiple-vehicle crash in Gaston County Saturday afternoon.

Gaston County EMS responded to a call of a multiple-vehicle accident a little before 2:30 p.m. in the southbound lanes of I-85 near Mile Marker 27 Belmont.

Belmont Police say the first collision involved two vehicles and there were no serious injuries. The second collision involved seven vehicles, including one tractor-trailer.

Seven people -- one of which was a toddler that was ejected from the vehicle while seated in a child safety restraint system -- and a service dog were transported to local hospitals. Police later said all patients, including the toddler, were all treated and released from the hospitals.

Southbound lanes of I-85 near Mile Marker 27 reopened after it was shut down for hours. Medic, Stanley Rescue Squad and Belmont Fire were at the scene to assist Gaston County EMS.

The cause of the accident is under investigation, Belmont Police said.