CEUTA, Spain — At least 18 migrants have died trying to reach the Spanish territory of Ceuta after thousands of people breached the frontier with Morocco and poured in. The border crisis boiled over Thursday and continued on Friday ahead of Spain's Prime Minister's visit to the exclave, with security forces clashing with migrants on the Moroccan side of the border. Live footage of the border showed hundreds of migrants gathered on a hill overlooking Ceuta being dispersed with tear gas by Moroccan forces, while others continued to swim to the Spanish territory. At the same time, large groups of migrants walked back from Ceuta toward Morocco to return home. Rachid Sbihi, who leads a local workers association representing Civil Guard officers, called the situation a “serious humanitarian crisis," saying thousands of migrants, including unaccompanied children, were left sleeping in parks and on sidewalks, while others roamed the streets aimlessly. “People are still entering. The reinforcements, including Spanish military troops, that have arrived are only helping the injured and other h