Regional Prefect Fabienne Buccio said the police presence was needed because "extremists" could try to intimidate migrants into turning down housing offers or buses to reception centers.
Interior Minister Bernard Cazeneuve said last week that authorities would work with humanitarian organizations to relocate the migrants to a nearby park of converted shipping containers or other reception centers around France.
On Thursday a judge upheld a government order to evict migrants living in the southern part of the camp, although a few makeshift buildings of social importance such as a school and a theater are to remain untouched.
Thousands of migrants fleeing war and poverty, from Afghanistan to Syria, have converged on the northern port over the past year.
Most attempt to climb illegally onto trains using the Channel Tunnel or lorries heading to Britain where they hope to settle. Their presence has led to tension with some of the local population and to a permanent police deployment.
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