BREAKING: Gas explosion cancels services

A gas explosion at Manurewa rail bridge has cancelled all services between Puhinui and Papakura. Weymouth Road is also closed. Fortunately there have been no reports of injury.

More to follow as it is reported.

UPDATE: Auckland Transport have just advised bus replacements are in place and NZ Bus are accepting rail tickets.

UPDATE 2: New Zealand Herald have updated their article:

Multiple explosions and a fireball have been reported on a rail overbridge on Weymouth Rd in Manurewa this morning. The road has been closed and fire crews on site are considering evacuating buildings.
The explosions are believed to have been caused by power cables, fire communications shift manager Jaron Phillips said.
"They started being reported to us before 8am. Some [witnesses] reported some kind of fireball and flames showing from the footpath area,'' he said.
What caused the power cables to make explosions is still being investigated.
The train line has been shut down and a nearby car park has been closed to traffic.
Commuters are advised to make alternative travel arrangements.
Three fire crews are on scene and another two are on their way.
So far it is unknown if there is any damage to the overbridge, which is near the Beaumonts Way intersection.
There are no buildings on fire, Mr Phillips said.

 (from http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10823742)