The ambulance service told Metro it sent two air ambulances, the Hazardous Area Response team, two ambulances and an ambulance officer vehicle to the scene.
The first crash between a motorbike and a car happened on the motorway near Stansted Airport at 4.46am this morning, which led to severe delays and queuing traffic in both directions.
Northbound traffic was stopped between junction J9 and J8 for an air ambulance to land following the crash.
The southbound carriageway remains closed between junctions J8 and J9 near Harlow following a second crash at about 8.05am.
Traffic heading northbound towards Stansted has since been released after the air ambulance departed.
