Rome (CNN) -- Forced to strip naked, outside and in full view of other migrants, a man is then hosed down. Others line up in a crowded courtyard to follow.

This is the humiliating treatment apparently meted out to migrants at a detention center on Italy's Lampedusa island, captured in secretly filmed cellphone footage and aired on Italian state TV channel RAI.

The images, purportedly filmed by a migrant who spent two months at the center, have sparked outrage in Italy and Europe.