The teenage star was attempting to escape photographers when one of the chasing vehicles struck her car.
The Mean Girls actress' worried mother Dina says, "I thank God my daughter was able to walk out of the car."
Los Angeles police confirm the over-zealous snapper was detained on suspicion of assault with a deadly weapon.
Lohan's representatives insist the actress, who has been dogged by illness, family troubles, romantic break-ups and news of weight loss concerns in recent months, is OK but shaken by the incident.
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