Record numbers of migrants gathering in Calais have sparked fears of a summer of violence and chaos.
Latest figures suggest 7000 migrants are at the squalid "Jungle" camp seeking to get to the UK.
On Friday hundreds of Afghan and Sudanese men wielding guns and knives fought bloody battles over smuggling routes. A French police source said: "Hundreds of men were involved in the trouble and many ended up with stab wounds.
"One person was shot and fires broke out. Around 40 men were badly hurt and a police officer was also injured."