The "great wall of Calais," as critics are dubbing it, will be built on both sides of a road that leads to the English Channel, where refugees try to make it onto boats heading to the UK.
The International Organization for Migration says deaths already total over 4,000 this year — 26 percent higher than in 2015 and increasingly concentrated in the Mediterranean.
The latest figures from the International Organization for Migration show that 2,977 people have died so far in 2016, with around 20 migrants dying each day since March.
Three operations were carried out off the coast of Libya on Tuesday retrieving around 500 survivors, most of which were rescued from an overcrowded wooden boat.
The Italian coast guard said the people were picked up from 25 dinghies and one boat, all north of the Libyan coast.
Several hundred migrants threw rocks, mattresses and branches onto the road to bring traffic to a standstill in an attempt to board vehicles to Britain, and riot police officers used up more than 600 canisters of tear gas to disperse the migrants.
An estimated 65.3 million people have been forced to flee their homes due to violence and conflict, according to a new report by the UN's refugee agency.
Turkey, a major sponsor of groups fighting to topple Syrian President Bashar al-Assad, has closed its borders to Syrian refugees.
Shortfalls of the Canadian government's plan to resettle 25,000 Syrian refugees in the span of a few months are become clear as many are still seriously struggling to make ends meet, eight months after the start of the program.
They often only make it as far as Mexico, where authorities detain and deport them. Despite Mexico's harsh immigration enforcement, most of the deportees plan to try to make the trip again immediately.
Medhane Yehdego Mered, nicknamed "the General," was arrested in May and had been heard on intercepted telephone calls boasting about cramming more people onto rickety boats than other traffickers.
About three-quarters of the bodies found near the western Libyan city of Zuwara in recent days were women, and there were at least five children.