The stabbing happened around 10:30 p.m. on West and Holmes avenues in Darien.
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Police say the driver picked up the customer in Stamford and was headed to Norwalk.
As the Lyft was entering the town of Darien, the driver was stabbed several times and crashed his vehicle into a tree to stop the attack.
The attacker fled the scene with the victim's cell phone.
The victim was transported to the hospital with non-life threatening injuries.
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Police believe the assault was a random attacked without provocation.
"Safety is fundamental to Lyft, and the incident described is completely unacceptable," a Lyft spokesperson said. "We've been in touch with the driver to offer our support and have permanently removed the rider account from the Lyft community. We are actively assisting law enforcement with their investigation."
Anyone with information is asked to call the Darien Detective Bureau at 203-662-5330.
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