New Zealand Police have stormed the area and are urging anyone in the area to stay indoors.
An eyewitness tells Radio New Zealand he heard shots fired and four people were lying on the ground, with "blood everywhere".
Earlier, Mohammad Isam - a reporter associated with ESPN Cricinfo - had written on Twitter that the "Bangladesh team [he is assigned to] escaped from a mosque near Hagley Park where there were active shooters".
Several minutes after they were barred from getting off the bus, the players escaped and ran through Hagley Park.
Shootings were reported at the Al Noor Mosque, the Linwood Masjid mosque and Christchurch Hospital.
Two police officers have confirmed that the bomb is inside a beige Subaru that has crashed on the street, roughly three kilometres from the Al Noor Mosque where the shooting took place.
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Mr Bush said, "a serious and evolving situation was occurring in Christchurch with an active shooter".
Bangladesh is scheduled play Test against New Zealand in Christchurch on Saturday.
"Police believe there may be other offenders", the New Zealand Police tweeted. And a second one, I ran.
"Alhamdulillah Allah save us today while shooting in Christchurch in the mosque", tweeted another player, Mushfiqur Rahim.
A New Zealand Cricket spokesperson said it was an "unfolding situation" around if the match would go ahead. "Frightening experience and please keep us in your prayers", he wrote.
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