Armed police have been deployed after receiving reports of shots fired in the city center at 1:40 p.m. Friday local time.
Speaking after the attack the Bangladeshi cricket coach Mario Villavarayen said the players heard shots being fired when they fled the mosque.
"A serious and evolving situation is occurring in Christchurch with an active shooter", police said in a statement.
Later Friday afternoon, media outlets said there also was a shooting at another mosque in Christchurch.
Christchurch City council said in a statement: "In response to a serious ongoing incident we're locking down number of central city buildings, including the Civic Offices and Central Library". People in the centre of the city should stay indoors, police said.
According to reports, gunshots have been heard near the Al Noor mosque in Christchurch, New Zealand, as police warn of a "critical incident".
The entire Bangladesh cricket team present at the site was just saved from the incident.
The Associated Press reported a witness saying there were many were dead in the shooting near Hagley Park.
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Much of Christchurch is in lockdown. An act that has absolutely no place in New Zealand.
The team are due to play a Test match in Christchurch on Saturday.
New Zealand Prime Minister Jacinda Ardern described the incident as an "unprecedented act of violence".
There were reports of armed police at a second mosque in the suburb of Linwood.
He said Bangladesh cricket board is in contact with New Zealand cricket authorities and would take further decision after consultation.
"I've lived next door to this mosque for about five years and the people are great, they're very friendly", he said. We want to keep our journalism open and accessible and be able to keep providing you with news and analysis from the frontlines of Israel, the Middle East and the Jewish World. One person is in custody, however Police believe there may be other offenders.
One man said the scene at the mosque was chaotic.