Forensics investigators were filmed collecting evidence at Al Noor mosque in Christchurch on Saturday, the place where dozens of people were massacred the day before.
Hearses could also be seen leaving the compound, with several local residents watching proceedings from behind police tape.
A total of 49 people were killed in the shootings, a further 48 were wounded.
The first report of an attack came from Masjid Al Noor Mosque in Christchurch during Friday prayers. The gunman then drove to the nearby Linwood Islamic Centre, where the second shooting occurred.
The main suspect, 28-year-old Australian Brenton Tarrant, appeared in court on Saturday charged with murder. Two more individuals have been arrested in connection with the attack.