NEW YORK (Reuters) - New Zealand Prime Minister Jacinda Ardenne said the country's arms acquisition law would be amended within 10 days, while a shopkeeper disclosed that Australia's Brandon Tarant, who attacked the mosques, had bought four pieces of weapons.

"We are still investigating the details of the incident, its causes and who is behind the culprit," Ardenne told a news conference after a cabinet meeting.

For his part, the police commissioner said the attacker of the two mosques was acting alone but may receive support, stressing that part of the investigation focuses on the possibility of people who helped the attacker.

Sarah Stewart Black, an official with the Department of Civil Defense and Emergency, said that a government committee had begun working with others to support victims and victims' families following Friday's Christchurch massacre in Christchurch.

She added that the committee is working continuously within the framework of the "National Center for Crisis Management" to manage the burial of victims and keep up with their relatives in full respect for traditions and the right to privacy

Purchase of weapons
In the context of revealing the details of the crime, David Teppel, owner of Gun City, said he had sold four pieces of firearms to Tarant, the bomber who killed 50 people and wounded dozens more.

He noted that Tarrant had bought four pieces of firearms and ammunition from Gen City on the Internet, but said he had bought semi-automatic weapons from elsewhere.

"We did not monitor anything unusual about the licensee," Teble said.

He confirmed that his shop was operating in accordance with current laws and had ways to verify that customers were not stockpiling weapons and ammunition.

Many questioned how the perpetrator of the Massacre had obtained a license to carry a New Zealand weapon and how he had obtained illegally modified weapons.

A prime minister has vowed to change the arms laws after the horrific massacre in the mosques.

Defending himself
Meanwhile, local media reported on Monday that Tarant, 28, plans to represent himself in court.

Richard Peters, the lawyer who represented Tarant at the court last Saturday, told the New Zealand Herald that he was no longer the executor of the bloody attack.

Tarant said he planned to represent himself in future trials, the newspaper said, adding that the accused militant did not seem mentally unstable. Tarrant is scheduled to appear before the Supreme Court on April 5.

The move has raised fears that Tarant will use his trial as a platform to disseminate his racist beliefs about white supremacy, like Norwegian right-wing activist Nedres Brevik, who killed 77 people in 2011.