More than 350 migrants including those rescued by a vessel sponsored by British street artist Banksy were being transferred onto a quarantine vessel off Sicily, aid workers said Wednesday.

“The first people have boarded the quarantine vessel and the operation is ongoing,” Mattea Weihe, spokeswoman for the Sea-Watch humanitarian organisation told AFP.

The 353 migrants on board Sea-Watch 4 include those rescued last week by Louise Michel, a 30-metre boat sponsored by the mysterious artist.