Kelebia

"Since the crisis began, for almost a month, access has been denied to anyone providing psychological, legal or other assistance, so they have no activities and are locked in the camps," Djurovic told BIRN.

Instead, the camp inmates "receive information through social networks and by phone contact with some of us", he added.

Several hundred migrants and refugees who tried to cross the border from Serbia to Hungary on Thursday night have been turned back by Hungarian police and moved to camps in Serbia.

The group arrived at the Kelebia-Tompa border crossing and spent the night protesting and attempting in vain to enter Hungary. Most came from Syria, Afghanistan, Yemen, Morocco and Palestine.

The Hungarian army has announced that it had completed construction of a border base in Kelebia, near the border with Serbia.

More bases are expected to be completed by spring in three other locations along the border.