The boulders appeared under a flyover at Porte de La Chapelle in the 18th arrondissement, of northern Paris, where migrants often sleep rough while waiting for one of the 400 spaces in the nearby official humanitarian welcome centre.
The boulders were put in place by the Paris City Hall, without the knowledge of Emmaus solidarité, the charity that runs the humanitarian migrant centre which opened November 2016.
Photo: P'tit Dej' à Flandre/Facebook
“It's not the first time that these boulders have been installed around the centre, we weren't advised about it the first time, nor were we this time," the association said.
The boulders are designed to make it hard for people to take shelter under the bridge, however those waiting for spots at the centre are managing to sleep in between the huge ocks.
“It's difficult to sleep here," one migrant told Le Parisien newspaper after the boulders were brought in.
This isn't the only piece of so-called "hostile architecture" Paris authorities have installed to stop migrants from making camps in the city.
After the camps at Stalingrad Metro was cleared, metal grills were erected blocking off areas where refugees had set up camps, such as along Avenue de Flandre and the Place de la Bataille-de-Stalingrad.
By Rose Trigg