The death toll following the attacks in two mosques of New Zealand has reached 40, according to New Zealand"s Prime Minister.

The gunman - who identified himself on Twitter as Brenton Tarrant from Grafton, New South Wales - live-streamed the mass shooting inside the Al Noor Mosque, which happened about 1.30pm (11.30am AEDT) as Friday prayers were underway.

A video seen by Daily Mail Australia shows the man firing multiple shots at dozens of people as they try to flee.

Four people are believed to be in custody, including three men and one woman. New Zealand Prime Minister Jacinda Ardern said they were not on terror watch lists.

Daily Mail has released photos, one of which shows the shooter"s weapons marked with the names of other people who, according to the edition, have carried out attacks. The names are written in various languages, including Georgian. In particular, the weapons are marked in Georgian with the names of Davit Aghmashenebeli and Davit Soslani.