The stabbing happened at a Crunch Fitness in the 12800 block of Valley View Avenue just before 5:30 p.m. and prompted a response from the Los Angeles County Sheriff's Department and the county fire department.
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According to the Norwalk sheriff's station, the man was stabbed somewhere in the back and was taken to a hospital, where he is in stable condition.
The assailant was only described as a man. He fled the scene, authorities said.
A weapon was not recovered.
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Further details about the incident, including a motive, were not immediately available.