* A large crack has been spotted in the side of the stricken container ship
* PM says ship could break up
* Soldiers called out to clean up beaches
* Ship's captain granted name suppression in court
* About 70 containers have fallen off the ship
* Masks may be issued to Tauranga residents near toxic oil leak
* Port of Tauranga is on standby to shutdown operations
* Environment Minister Nick Smith says this is NZ's "worst maritime environmental disaster"
A "massive crack" running down the side of the stricken Rena cargo ship has been spotted by TV camera crews, a report says.
Aerial footage shows the hull of the vessel grounded on Astrolabe Reef off the coast of Tauranga has split, TVNZ reported this afternoon.
It also showed a container from the vessel emitting bright blue smoke as it floated in the ocean.
Prime Minister John Key has announced the stricken Rena cargo ship has "stress fractures" in its hull and may break up.
In a press conference at Maketu this afternoon, he told media the boat has sustained more damage to its hull.
"We have identified stress fractures along the boat so we can't rule out the risk of the ship breaking up."
Hundreds of dead birds have been found dead on the beaches around Tauranga as the oil from the container ship continues to cause environmental havoc.
Maritime New Zealand is considering issuing face masks to people living near beaches affected by the oil and New Zealand soldiers are now clearing up the Tauranga beaches affected by oil from the stricken container ship Rena.
The "world's best" navy architects are preparing reports on the damage to the Rena, while the ship's captain - who turned 44 on the day of the accident - has had his name suppressed during a brief appearance in court. more