VIDEO: Horse, mule loose on I-680 near Walnut Creek

WALNUT CREEK, Calif. (KGO) -- Some of you on Interstate 680 near Walnut Creek on Monday were driving next to some real horse power. You are not going to believe this video.

Somehow a white horse and a brown mule horses got loose on the freeway and kept running for a while in the fast lane.

Steve Burdo with Contra Costa County Animal Services says the animals broke through a fence about a mile away.

The pair adhered to the vehicle code and used an on-ramp to enter the highway.

Authorities shut down lanes shortly before 7:30 a.m. as motorists shot cellphone video and officers rounded up the four-legged fugitives.

Burdo says the horse, a gelding named Striker, appears to have led the breakout. He says Hank the mule is more of a follower.

The four-legged fugitives are fine. Their owners were eventually able to wrangle them and get them onto a horse trailer.

Click here for more stories and videos about horses!

The Associated Press contributed to this report.