It's disturbing people in the middle of the night, a Christchurch resident says.
About 48 were injured in the massacre, many of them self-employed taxi or truck drivers.
The event is being run by the Transportation Group of Engineering New Zealand.
Police were called to a property in New Brighton at 6.30pm on Monday.
The driver was on their way to fix a burst water main in Linwood when it happened.
Monthly counselling sessions help them heal from their past traumas.
The councillor was ousted after claims he sent inappropriate messages to youth.
Fire crews will remain at the scene overnight.
The number of people arrested is unknown.