Prime Minister John Key, whose Helensville electorate includes the west Auckland suburb struck by a deadly tornado today, has extended his condolences to the friends and families of the victims.
Three people were killed when a concrete slab landed on a truck at a new school construction site in Hobsonville just after midday.
"This must have been an extremely frightening situation for many people in the local community," Mr Key said in a statement this afternoon.
"I'd like to thank the emergency services staff, who are responding to the situation. It's critical they are able to focus on the response."
Mr Key said he was being kept up to date with the situation.