The Government says the police are considering mounting a prosecution following the collapse of the CTV building in Christchurch during the earthquake in February 2011.
Most of the families of the 115 people killed in the collapse have written to the Prime Minister asking for legal assistance to help them hold someone accountable.
Maan Alkaisi, a representative of the families, said a Royal Commission of Inquiry has found negligent engineers were involved in the building's construction.
Speaking on behalf of the Prime Minister in Parliament on Thursday, Economic Development Minister Steven Joyce said he understands the police are investigating.
Mr Joyce said the police have yet to decide whether they will bring a prosecution.
He said the Prime Minister received the families' letter this week, but had yet to read it.