Opera House lit up with NZ Silver Fern

A silver fern has been projected onto the Sydney Opera House as a symbol of solidarity for the people of New Zealand following the Christchurch attack.

The sails of the Opera House were lit up on Saturday night, a day after Muslims were massacred while worshipping at mosques in Christchurch.

The Silver Fern of New Zealand illumination represented "solidarity, support and respect" after at least 49 people were killed when an Australian alleged gunman stormed two mosques.

Premier Gladys Berejiklian said the display demonstrated the state's unity and compassion towards everyone affected by the attacks.

"We feel the loss in Christchurch especially deeply given the closeness of our two countries. It is as though this has occurred on our own soil," Ms Berejiklian said.