Vector Energy says it's identified the source of the leak, but it's going to be a slow process to fix the pipeline. The company says removing gas from the line could cause an explosion..

A high-powered group of global oil and gas exploration companies have arrived in Wellington today for a targeted push to encourage new interest in New Zealand's under-explored frontier basins.

Shell has joined the hunt for oil in the Great South Basin and is ready for any protest action that may target new exploration.