The Love Aotearoa, Hate Racism rally took place at Aotea Square in Auckland on March 24 in response to the Christchurch shootings.

A man wearing a Donald Trump shirt has yelled abuse at members of the Muslim community gathered at one of the mosques targeted in the Christchurch terror attack.

Of the 50 victims killed in the March 15 shootings, more than 40 were at Masjid Al Noor, on Deans Ave. On Wednesday afternoon, a man wearing a shirt supporting United States President Donald Trump turned up outside the mosque and started yelling abuse.

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Yasmeenah Safiya, 17, was not there at the time, but heard about it from a friend who was. The friend called her in a distraught state, Yasmeenah said, asking if she had heard what happened.

"She was like, 'a guy just came in wearing a Trump shirt and he was shouting abuse at all of us'."

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A post on the Muslims in Christchurch and Canterbury Facebook page said the man was wearing a shirt that said "Trump for New Zealand". A photo showed the man standing beside two police officers in the Trump shirt.

The man was swearing and saying that Muslims were terrorists, according to the post. He also told people at the mosque, people who were still grieving the loss of their loved ones, that "we all need to leave" New Zealand, the post said.

SUPPLIED Police speak to a man wearing a Donald Trump shirt who allegedly yelled abuse outside Masjid Al Noor in Christchurch on Wednesday.

"He was there for about 15 minutes, he also kicked and tried to damage some of the memorial items along Deans Ave in front of the masjid."

Armed police have been stationed outside the mosque since the attack. Police were present while the man was yelling abuse, but did not arrest him. A spokeswoman said officers made the decision not to "potentially inflame the situation at that significant location".

Police were now actively looking for the man. He could face a disorderly behaviour charge, the spokeswoman said.

Many people have returned to the mosque since it re-opened eight days after the attack, but others have been reluctant. One member of the Muslim community, who did not want to be named, said the "racist abuse" from the apparent Trump supporter would only make things worse.

IAIN MCGREGOR/STUFF A man wearing a Donald Trump T-shirt has verbally abused people gathered at Masjid Al Noor, where more than 40 of the 50 March 15 terror attack victims were killed.

For Yasmeenah, the incident was another example of the prejudice and racism present in New Zealand – something she experienced firsthand on the day of the attack when she was told by a man "you should have been shot".

The 17-year-old was running late for Friday prayers and was on her way to Masjid Al Noor when she started getting messages about the shooting. She pulled over near a Thai restaurant on Riccarton Rd, just around the corner from Deans Ave, and proceeded on foot.

"My best friends were all in there, so I was trying to get inside," she said. Police had already arrived by this point and stopped her getting any closer.

After waiting in a nearby street, Yasmeenah headed back to her car. A "sleazy" white man standing near the restaurant mumbled something at her as she walked past, Yasmeenah said.

"He said some racist thing to me, and then I turned around and said 'what did you say?' And then he said 'you should have got shot as well'."

Yasmeenah was shocked. She was already deeply distressed by what had happened, and couldn't believe what she had just heard.

"I wasn't even thinking about how I felt at that moment. I was more worried about all of my loved ones inside the masjid."

People needed to acknowledge the racism and prejudice that existed in New Zealand, Yasmeenah said.

"I just want the people of New Zealand to know that racism is still here, and it frustrates me when people say that racism is not us because it's been happening for years."