EU border migrant crisis

A massive migrant rush to Spain's North African territory Ceuta has rattled the EU exposing sharp divisions within the EU over border and migration policy. The EU has pledged emergency financial and operational support for Spain while acknowledging deep seated disagreements among member states on border sharing. Meanwhile, the UN has been closely monitoring the humanitarian fallout of the event as the High Commissioner for refugee called for the protection of vulnerable people meet the border turmoil. What are the migrant crisis root causes? What does it take to deal with the aftermath now?