Authorities in Morocco have arrested 111 people attempting to cross into Spain's Ceuta, amid tightened security triggered by a deadly mass crossing in July.

The annoucement comes as calls resurfaced on social media for mass crossings into the Spanish enclave in North Africa.

Morocco arrests suspects over social media calls for mass crossings into Ceuta and Melilla, reinforcing border security with Spain ahead of August 15.

Morocco has mobilised hundreds of riot police and eight naval vessels near Ceuta amid online calls for another mass crossing on August 15