Image source, Getty ImagesImage caption, The tragic incident happened shortly before an Abba tribute concert in Sweden

Two people have died and another has been injured after a person fell seven floors at a concert hall in Sweden.

Around 1,000 people had gathered at the Uppsala Konsert & Kongress hall near the capital, Stockholm, for an Abba tribute concert on Tuesday evening.

But 30 minutes before the show was due to begin, a person fell and landed in the open foyer on the ground floor.

They landed on two people, police said. The person who fell died as did one of the people they hit.

The third person was left with non-life threatening injuries and has since been taken to hospital.

None of the victims have been named by police.

"We received a call about someone having either jumped or fallen from a high altitude," police spokesman Magnus Jansson Klarin told the AFP news agency.

He said officers were working to establish what exactly had happened, adding that it was too early to say whether a crime had occurred.

The concert hall was initially closed by police so witnesses at the scene could be questioned.

MTLive, the events company that organised the show, wrote on their Facebook page that "everyone is in shock".

"Unfortunately, we have to announce that a terrible event has happened. What we know is that someone jumped [or] fell high in the arena and hit other people," the company said.

"Right now we don't know much more, everyone is in shock," it added.

The tragic incident comes just days before Abba are due to release their first new album in more than 40 years on Friday.