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Bjorn Ulvaeus (Dominic Lipinski/PA)

Bjorn Ulvaeus (Dominic Lipinski/PA)

Bjorn Ulvaeus (Dominic Lipinski/PA)

Abba star Bjorn Ulvaeus has said people need to be “very careful” about the use of avatars in the future as they could be used as a force for bad.

The 77-year-old reformed with the Swedish troupe after almost 40 years to create a physical concert featuring “Abba-tar” versions of themselves as they appeared in 1977, singing and dancing to their greatest hits.