Police say a driver had a seizure, causing a chain-reaction crash involving several vehicles Tuesday evening on Interstate 635 in southern Dallas County.
The crash was reported before 6 p.m. where I-635 and Interstate 20 connect in Balch Springs.
The driver who suffered the seizure was rushed to a hospital in unknown condition. No other drivers needed medical attention, police said.
Two lanes of southbound I-635 were closed at eastbound I-20, and they were back open by 7 p.m.