CASABLANCA, Morocco (AP) — Morocco said Wednesday it has beefed up security along its border with Spain as calls resurfaced on social media for mass crossings into the Spanish city of Ceuta, raising concerns of another surge, similar to the one last month when tens of thousands of migrants rushed the border.

Spain’s Civil Guard insisted that the border will remain closed and Defense Minister Margarita Robles warned against any new attempt at a mass entry into Spain’s North African exclaves.