A 16-year-old cyclist is in a life-threatening condition after being hit by two cars.
The boy was critically injured in the collision in Streatham High Road shortly before 11.20pm on Friday.
The Metropolitan police said officers believe the boy had been cycling on the road when he was in collision with a car and, seconds later, was struck by a second car travelling close behind.
The drivers of both vehicles, who are not thought to know to each other, failed to stop at the scene, police said.
Two men, both aged in their 20s, were later arrested at separate locations in the area and are in custody at South London police stations.
The teenager was taken to hospital where he remains in a life-threatening condition.
Officers said inquiries were ongoing to establish the full circumstances and have appealed for witnesses or anyone with dashcam footage to call the serious collision investigation unit at Catford on 020 8285 1574.
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