"One man in his late 20s, whom the authorities declined to name, was charged with murder and was expected to appear in court on Saturday morning".
Mohan Ibrahim told the New Zealand Herald: "At first we thought it was an electric shock but then all these people started running".
None of the four who were arrested had been on a national security watch list, Bush said, adding they were not known to Australian authorities either.
The investigation into today's shocking terror attack remains on-going. He described the gunman as "an extremist, right-wing, violent terrorist".
Four suspects - three men and one woman - have been detained so far, and multiple explosive devices were defused, according to multiple reports citing the New Zealand police and its commissioner, Mike Bush.
"Our hearts are broken over today's bad tragedy in New Zealand", YouTube, which is operated by Google, said in a Twitter posting.
The foreign ministry says there are 330 Indonesian citizens in Christchurch, 130 of them students.
The attack has also been condemned by world leaders.
The suspect during a trip to Pakistan last year
The Bangladesh cricket team was arriving for Friday prayers when the shooting occurred but all members were safe, a team coach told Reuters.
Witnesses spoke of seeing bloodied bodies, with children also believed to be among the dead, and police warned of "extremely distressing footage" of the incident circulating on the internet. "Three of which were outside the mosque itself".
He noted that the government of New Zealand has cancelled all remaining flights to Christchurch as the city grapples with the mass shooting.
One person is in custody in relation to fatal shootings at two Christchurch mosque that has claimed at least nine lives.
A spokesman said the attack happened as some of players got off a team bus and were about to enter the mosque.
"Police are responding with its full capability to manage the situation, but the risk environment remains extremely high", Bush said.
30 people are confirmed to have been killed inside the Al Noor mosque on Deans Avenue in Christchurch's west.
New Zealand's charitable healthcare organization St John said 20 of its ambulance cars and operational vehicles had been working on the scene of a firearms incident. New Zealand Terror Attack: 40 Dead In Christchurch Mosque Shootings, Says NZ PM Jacinda Ardern.
Ms Ardern at her news conference alluded to anti-immigrant sentiment as the possible motive, saying that while many people affected by the shootings may be migrants or refugees "they have chosen to make New Zealand their home, and it is their home".
KPRC2 Houston travelers concerned over grounding of Boeing 737 planes
The European Union, India and Canada, among others, have temporarily prevented the Max 8 planes from taking to the air. The Federal Aviation Administration initially said it did not believe there was any reason to ground the Max 8s.
Lonzo Ball out for the remainder of the season
The Lakers went 15-8 when LeBron James , Ingram and Ball all played this season. "And so many teams in the West are playing well. Bosh eventually retired due to blood clotting issues, but many other athletes have continued to compete.
Sebastian Vettel Fired Up To Return Ferrari To The Top
Since he last raced in 2010, a lot has changed in Formula One, so it will be a massive learning curve for the Polish driver. Toro Rosso's Alexander Albon spun and hit the wall during Practice 1 , leading to the session being red flagged.