Pop group Abba are set to make a major announcement, as fans await the release their first new music in 39 years.

The Swedish band launched a new website titled Abba Voyage, asking fans to register interest in a new project.

It is expected to be a hologram tour that the group initially announced in 2016.

The band are also expected to release five new songs to accompany the show.

Abba shot to fame after performing Waterloo during the 1974 Eurovision Song Contest, held at The Dome in Brighton.

The Argus: Abba shot to fame after performing Waterloo during the 1974 Eurovision Song Contest, held at The Dome in Brighton Abba shot to fame after performing Waterloo during the 1974 Eurovision Song Contest, held at The Dome in Brighton

The quartet reportedly spent the evening partying in the first-floor Napoleon suite of The Grand Brighton Hotel.

In June 2017, a blue plaque was place outside Brighton Dome to commemorate the win.

The UK entry in 1974 was Olivia Newton-John, who was considered a strong contender with her song Long Live Love. She ended up finishing in fourth place.

Abba’s Bjorn Ulvaeus, 76, and Benny Andersson, 74, were seen arriving in London on Thursday ahead of making the announcement.

The group - which is also features Agnetha Faltskog, 71, and Anni-Frid Lyngstad, 75 - are expected to announce new music.

The announcement is due to take place at 5.45pm UK time.

While details are unknown, the group is expected to announce the release of their first new songs since the 1980s and the launch of a new theatrical show in which they will perform as hologram "Abbatars".

Last week, the band announced on Twitter: “Thank you for waiting, the journey is about to begin.”

Abba are said to have teamed up with Pop Idol creator Simon Fuller to bring the show to life.

Plans for the comeback have been in place since 2019 but were delayed because of Covid-19.