The upthread HN claim was that this "was an attack".

The Xitter claim was that:

  Moroccan traffic police keeps directing thousands of illegal migrants toward the Spanish border fence in Ceuta.

  This is a state-orchestrated invasion of Spain.

No visible attack, no proof that the people visible are "thousands of illegal migrants" nor of where they are or where they are headed.

Are you claiming this video shows free trains for immigrants?

It shows people on cars and police waiving them on like all the other traffic. So possible they especially were set up for the immigrants, but no idea how one can conclude that from this short clip.