Around 500 sub-Saharan African migrants crossed the fenced border surrounding Spain's North African enclave of Ceuta from Morocco early on Friday, emergency services said.

Dozens of migrants, many with wounds from climbing over the 6-metre barbed wire fence, celebrated in the streets in the early hours of the day with some shouting "freedom", TV footage showed.

Police and local government officials in Ceuta were not immediately available to give further details.

The Red Cross was treating some 400 migrants at its centre there and had dispatched five ambulances to help, Ceuta's emergency service said on its Twitter page.

Spain's two enclaves in Morocco, Ceuta and Melilla, are often used as entry points into Europe for African migrants, who either climb over their border fences or try to swim along the coast.

In January, around 1,100 migrants tried to cross into Ceuta although most were eventually turned back.