"A serious and evolving situation is occurring in Christchurch with an active shooter", Police Commissioner Mike Bush was quoted as telling reporters.
Reacting to the shooting incident, New Zealand Prime Minister Jacinda Ardern said that this is one of the country's darkest days.
Several people were reported dead after a gunman opened fire in a mosque during Friday prayers in Christchurch, New Zealand, on Friday.
"The multiple fatalities are, as far as we know, at two locations", he said.
"Again, we are unsure if there are any locations outside of that area that are under threat". The ESPNcricinfo correspondent posted a video on Twitter of the cricket players hurrying through nearby Hagley Park as sirens wailed in the background.
"Police urge anyone in central Christchurch to stay off the streets and report any suspicious behaviour", he said in a statement.
Police have confirmed they are responding to a "critical incident".
Media reports say armed police are clearing buildings in the vicinity.
She said police were working to get the situation under control.
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Radio Sport commentator Bryan Waddle, who is at the Hagley Oval, very close to the Al Noor mosque, is reporting that staff at the stadium have told them to remain where they are after "a new incident".
Officers have reportedly also cleared Cathedral Square, where thousands of children were holding a rally for action on climate change.
New Zealand historically has had only a handful of mass shootings events. "It's unbelievable nutty. I don't understand how anyone could do this to these people, to anyone".
Ms Jamieson said shaken survivors had told her how the shooting unfolded.
Armed police patrol outside a mosque in central Christchurch. "Lots of police and ambulance have come, and they did not allow us to go in the mosque or to get close to it", he said.
"We've probably seen 10 ambulances".
She says of the people who were attacked, "New Zealand is their home, they should have felt safe here".
"One man had been shot twice - once in the abdomen and once in the shoulder. he was conscious".
"I heard a big sound of the gun". And a second one, I ran. "I ran behind the mosque", he told TVNZ.