Police have also charged "one man in his late 20s" with murder.
Others across Suffolk have also paid their tributes to people involved in the attacks.
Reacting to the Australian Prime Minister's remarks, former defence minister and the PML-N leader Khawaja Asif said: "Good to see you eventually, and unequivocally characterized the attack as what it really is".
The flag flies at haft mast on the New Zealand High Commission in London.
Police said the investigation had extended 360 kilometers (240 miles) to the south, where homes in Dunedin were evacuated around a "location of interest". The police said there were also multiple improvised explosive devices attached to vehicles as part of the attack.
"I have now had the opportunity to be fully briefed with the details of the unprecedented events that took place in Christchurch this afternoon".
Chicago police said there are no known threats to Chicago, but they will be keeping a closer eye on mosques. Another video, taken by someone else, showed police apprehending a gunman on a pavement by a road. "There have been some absolute acts of bravery".
New Zealand's prime minister says that man wrote a 74-page document expressing anti-Muslim and anti-immigrant beliefs.
Neil Basu, the Met's national policing chief for counter-terrorism, said: "We will be stepping up reassurance patrols around mosques and increasing engagement with communities of all faith, giving advice on how people and places can protect themselves".
JOSEPH JOHNSON STUFFArmed police on Linwood Ave and specialist armed police after the Linwood Mosque came under attack
The shootings took place in Christchurch, New Zealand near Cathedral Square and Hagley Park.
Four people have been arrested in connection with the attack.
Officers responded to reports of shots fired in central Christchurch at about 1.40pm local time (12.40am GMT), and urged people in the area to stay indoors.
Speaking to CNN, witness Mohan Ibn Ibrahim said he was inside the mosque when the shooting began and that he heard the gunman "continuously shooting for ten to 15 minutes". He said he and others escaped by breaking through a glass door.
"Solidarity with the people of New Zealand grieving over the heinous terrorist attack in Christchurch".
"My warmest sympathy and best wishes goes out to the people of New Zealand after the disgusting massacre in the Mosques", he tweeted.
In the video, the shooter parks his auto next to the mosque and gets out of the vehicle with a rifle. After parking, he took two guns and walked a short distance to the mosque where he opened fire.
Police stand outside a mosque after the shooting.
"Who is he to decide who lives and dies?"
"That (earthquake) brought all the skyscraper buildings down and this is one of the reasons why people are fearful, I feel", he told CNN.
Three Bangladeshis were among the dead and one was missing, the consulate said. "It's unbelievably nutty. I don't understand how anyone could do this to these people, to anyone".
Forty-one of the people were killed at Al Noor Mosque, while seven died at Linwood Mosque. The remaining victim succumbed in hospital.