Taxi company security is under scrutiny from the government following the weekend killing of a taxi driver in Christchurch.
Father of five Abdulrahman Ikhtiari, 39, died from a stab wound after being attacked on Worcester St in the central city early Saturday morning.
Transport Minister Steven Joyce will review the use of distress buttons, video cameras and safety screens to separate drivers and passengers.
Police have yet to find two men believed to have been the driver's last fare and are appealing for witnesses .
The two men are described as in their mid-20s, about 1.8m tall, both with dark skin, of medium athletic build with short dark hair. One man was wearing a white bandanna or cap and dark clothing, and the other was wearing a white top and dark trousers.
Ikhtiari, originally from Afghanistan, is believed to be one of the Tampa refugees allowed to settle in New Zealand.
Over 400 Afghan refugees were rescued from a sinking Indonesian fishing boat off the Australian coast by a Norwegian container ship, the Tampa, in August 2001.
In the controversy that followed, the Australian government refused to allow the refugees into Australia and they were taken to Nauru.
About 140 of them were later allowed to move to New Zealand.
Ikhtiari is reported to have arrived in New Zealand in May 2002.
A post mortem examination has revealed he died of a significant stab wound and a few minor ones.
Police are yet to locate the weapon.
Meanwhile, the Christchurch taxi company which employed Ikhtiari
is setting up a fund for his family.
United Taxis says it is still coming to terms with his death and the main priority is helping look after his family.
A trust fund has been established to support the dead
taxi driver's widow and children.
Account Name: Rahman I Trust
Account Number: 12 3240 0098055 00