Paramedics from the London Ambulance Service were called at 2.37am this morning (April 25) with reports of a crash on Drummond Street.
Ambulance crews, an incident response officer and clinical team manager were dispatched to the scene, with the first responders arriving in less than five minutes.
The crash was found to have occurred at the junction with Hampstead Road.
Three people were found injured and one was discharged at the scene. The remaining two patients were taken to hospital.
Hampstead Road remains closed this morning for crash investigation work, and buses are diverted.
A London Ambulance Service spokesperson said: “We were called at 2.37am today (25 April) to reports of a road traffic collision on Drummond Street, NW1.
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“We sent ambulance crews, an incident response officer and a clinical team manager to the scene.
“Our first paramedic arrived on scene in less than five minutes.
“We assessed three people. We took two patients to hospital and discharged the other patient at the scene.”