One of the five judges in the trial against Anders Behring Breivik, who killed 77 people in twin attacks in Norway last year, was caught on camera playing solitaire online during proceedings on Monday.

In a screen capture published on the website of newspaper Verdens Gang, one of the three lay judges hearing the case, Ernst Henning Eielsen, can be seen playing the card game on his computer as a Swedish professor testifies to the court.

"The judges are attentively following what is being said and what is being presented to the court," an Oslo court spokeswoman, Irene Ramm, told AFP.

"There are different ways of staying focused," Ramm said, adding that Eielsen did not deny having played a game of cards.

On July 22, 2011, Breivik first bombed a government building in Oslo, killing eight people, before going on a shooting rampage on the nearby island of Utoeya where the ruling Labour Party's youth wing was hosting a summer camp.

He killed 69 people in his island massacre, most of them teens, with the youngest having just celebrated her 14th birthday.

The photo was published on Verdens Gang's website.

[A photo grabbed on a video released by Norwegian televison NRK shows Ernts Henning Eielsen, one of the five judges in the trial against gunman Anders Behring Breivik, playing solitaire online during court proceedings. AFP Photo/Nrk]