As the extent of pollution became clear on five islands including Terschelling, coastguards searched the North Sea for missing containers.
The cargo fell off the MSC Zoe near the German island of Borkum, but the tide carried many of them to the south-west. Initial images showed children’s toys and TVs on Dutch beaches.
But officials said three containers carried toxic substances, and Dutch and German coastguards warned local people to steer clear of them. One of those containers had a cargo of peroxide powder, and a 25kg bag of the chemical was found on the island of Schiermonnikoog on Thursday, along with several containers and their contents.