Migrant shacks burned in Ceuta, and a fire the account treated as arson called 'a loud and clear message.'

A loud and clear message is praise for how well something was said. Said of a fire the account itself calls deliberate, on people's homes, it treats the burning as speech and the burned shelters as the way the point was made, which makes violence a legitimate way to talk to the group living there. The people inside the shacks are the audience for the message, and their homes are the paper it was written on.

There is another way to read the line. It seems like a loud and clear message can describe intimidation without approving it, the way someone might say a brick through a window sends a message. We read it as approval, with some room for doubt, because the post has no word for the people burned out and no name for the act beyond message, and because of the company it keeps. The same day the account called the people of the shantytowns invaders and compared them to rats, and within the hour it posted that patience has a limit. A fair-minded reader should see that the account describes the group as vermin, then describes fire on their homes as a message, and that the second follows from the first.