Tributes from all over the world have been flooding in with The Queen sending her condolences to the families who lost loved ones.
President Trump, British Prime Minister Theresa May and for US president Barack Obama were among some of the world leaders who have also tweeted their condolences.
“I have been deeply saddened by the appalling events in Christchurch today. Prince Phillip and I send our condolences to the families and friends of those who have lost their lives," The Queen said in a statement.
The Duke and Duchess of Cambridge and The Duke and Duchess of Sussex also tweeted, "Our hearts go out to the families and friends of the people who lost their lives in the devastating attack in Christchurch." and in another tweet said, We send our thoughts and prayers to everyone in New Zealand today. Kia Kaha."
The Prince of Wales also sent a message to the Governor-General of New Zealand.
“Both my wife and I were utterly horrified to hear of the most barbaric attacks on two mosques in Christchurch, which resulted in the cruel and tragic loss of so many people’s lives. It is beyond all belief that so many should have been killed and injured at their place of worship and our most special and heartfelt sympathy goes out to all the families and loved ones of those who have lost their lives.
"This appalling atrocity is an assault on all of us who cherish religious freedom, tolerance, compassion and community. I know that the people of New Zealand will never allow hate and division to triumph over these things they hold dear.
"Our thoughts and prayers are with the victims’ families, the first responders, the people of Christchurch and all New Zealanders at this most heartbreaking of times," Prince Charles said.
Donald Trump and Ms May tweeted their support as well.
"My warmest sympathy and best wishes goes out to the people of New Zealand after the horrible massacre in the Mosques. 49 innocent people have so senselessly died, with so many more seriously injured. The US stands by New Zealand for anything we can do. God bless all!" Mr Trump said.
"There can be no place in our societies for the vile ideology that drives and incites hatred and fear. Our thoughts and prayers are with the people of New Zealand," Ms May tweeted.
Former President Barack Obama also sent a tribute, "Michelle and I send our condolences to the people of New Zealand. We grieve with you and the Muslim community. All of us must stand against hatred in all its forms.”