Additional security

Added security for NRL match

Top-flight sport returns to the city on Saturday when Manly stage a "home" match at Christchurch Stadium a fortnight after the mass shootings at two mosques which claimed 50 lives.

New Zealand has been placed on a high threat alert since and police have reminded event organisers nationwide to be aware that a proliferation of memorial events has the potential to stretch law enforcement resources.

However, a large police presence remains in Christchurch and will be out in force at Friday's National Remembrance Service at Hagley Park.