The Christchurch terrorist attack has prompted an unprecedented surge in online activity by white supremacists as well as a call by a group with Islamic State links for attacks on Australians travelling in Indonesia, according to ongoing analysis by an American intelligence firm.

According to Rita Katz, the director of the SITE Intelligence Group, the wave of online support that the Christchurch attack continues to attract is unlike the response to any other right-wing attack.

“Attacks always spark reactions from different extremist communities, but when it comes to the far right, there was never anything like the response to the Christchurch attack,” she told The Sun-Herald.

A girl carries flowers to a memorial wall following the mosque shootings in Christchurch, which left 50 dead and 39 wounded. Credit:AP

“His target, deadly execution, and his live streaming of the event fuelled these communities’ unprecedented response. The reactions were like nothing we’ve ever seen thus far from the far-right across the globe,” she said.