New Zealand's Police commissioner, Mike Bush, was quoted by Reuters as saying that multiple fatalities occurred at two mosques, where at least one gunman had opened fire on worshippers.
Police officials did not immediately comment on whether the incident took place in the mosque or nearby.
The team is in Christchurch to play New Zealand in the third cricket test starting tomorrow.
Christchurch Hospital has urged people to avoid the area unless they are seriously injured.
He said there was an anti-Islamic motivation to the attack but it was anti-immigration, anti-ethnic replacement and anti-cultural replacement in origin.
The bomb is located inside a beige Subaru that crashed almost three kilometres from the Al Noor Mosque where the shooting took place.
People stand across the road from a mosque in central Christchurch, New Zealand, Friday, March 15, 2019.
"Many of those who will have been directly affected by this shooting may be migrants to New Zealand, they may even be refugees here", she said.
They say one person has been taken into custody.
He said some managed to escape through windows and doors but "many people had been hit, some as young as 16".
"It was very peaceful, calm and quiet, as it is when the sermon starts, [you could hear] a pin drop", Farid Ahmed said.
There have been two shooting incidents - at the Masjid Al Noor Mosque next to Hagley Park, and at the Linwood Masjid Mosque in the suburb of Linwood in Christchurch, New Zealand.
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Another witness told stuff.co.nz that he had seen at least four people lying on the ground with "blood everywhere".
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He then exited the mosque through the front door - after just under three minutes inside and headed into the street - firing random shots as cars drove past.
"I saw people jumping over the back fence of the mosque into Oakward Close".
Mass shooting in Christchurch, New Zealand.
The man first shot several elderly people sitting on chairs during prayers, he said.
Gunshots were heard near the Al Noor mosque around 1:40 p.m. local time. "I just don't understand it".
He said he also saw the gunman flee before emergency services arrived.
A second shooting has also occurred at another mosque in the suburb of Linwood, while a suspicious device, thought to be a bomb, has reportedly been found in a vehicle on Strickland Avenue.
He saw two injured people carried on stretchers past his shop.
Eyewitnesses have told how a gunman has opened fire at a mosque in Christchurch, New Zealand, with unconfirmed reports of dozens of casualties.
The man claiming to be the shooter identified themselves as Brenton Tarrant - a white, 28-year-old Australian-born man.