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A man who was riding a horse along the eastbound 91 Freeway in Long Beach during the early morning hours Saturday was arrested on suspicion of DUI, according to California Highway Patrol officials in Santa Fe Springs.

Luis Alfredo Perez was taken into custody about 1:30 a.m. on his 29th birthday, according to a CHP news release. The agency posted several humorous tweets about the incident.

Perez was riding the horse eastbound on the freeway from Paramount Boulevard to Downey Avenue when a 911 caller reported him to CHP, the release stated.

Officers found him after he exited the freeway at the Downey Avenue exit and was riding into Bellflower. The officers gave Perez a field sobriety test and a preliminary alcohol screening device test, which showed a blood-alcohol level of more than double the legal limit.

He was booked into jail on suspicion of “DUI on a horse,” the release said.

The animal, described as a white Arabian named “Guera,” was unharmed and was released to the suspect’s mother. A CHP official said she came to the scene quickly.

“Just when you think you’ve seen and heard it all … you haven’t!” CHP Officer Jeremy Tolen said in an email.