Traffic grinds to a halt after 2 horses are killed on the I-5 Freeway

Traffic slowed down on the I-5 Freeway Tuesday night after a runaway horse died in one of the lanes. 

The California Highway Patrol said three horses started running across several lanes of the busy highway a little before 9:00 p.m., near the transition road on the westbound 210 Freeway close to the Newhall Pass. 

Two horses died after colliding with a car in the middle lane. It eventually died in the No. 4 lane. The driver pulled over to the side of the freeway as some passersby tried to wrangle another horse. 

It's unclear how the horses got on the freeway.