Masked Men shot and killed one man after they opened fire on a group of worshipers in a church.

According to Turkish officials, one man was killed after gunmen opened fire inside a Catholic church in Istanbul during Sunday mass in what appeared to be a targeted attack.

The attack was carried out by two masked men at the Santa Maria Church on Sunday. The attack, which was captured in a viral social media video, showed the masked men entering the building before they began shooting.

Turkish officials said the incident looked like a targeted attack against one person rather than against the Catholic church. The gunmen, who are believed to be connected to the Islamic State terror group, killed a man identified as Tucker Cihan during their attack.

According to Daily Mail, Cihan’s nephew, Cagin, who identified his body, told the reporters that the target was the church, as his uncle, who he described as mentally disabled, had no connection to politics or any criminal organization.

“He was a mentally disabled individual who had no connection to politics or criminal organizations,” Cagin said. “He went there on an invitation and was a victim of fate.”

Turkey’s Interior Minister Ali Yerlikaya condemned the attack and stated that the authorities were working to track down the mystery killers.

‘We will never tolerate those who try to disrupt the peace of our country,” Yerlikaya said. “Terrorists, their collaborators, both national and international criminal groups, and those who aim at our unity and solidarity.”

Istanbul’s Mayor, Ekrem Imamoglu, offered his condolences and support for religious minorities in the city.

‘There are no minorities in this city or this country. We are all actual citizens,” he said.

Pope Francis, who condemned the attack, expressed his support for the Catholic church during public remarks at the Vatican on Sunday.

“I express my closeness to the community of the church in Istanbul, which during the Mass suffered an armed attack with one dead and some wounded,” he said.

Turkey’s ruling AKP party spokesman, Omer Celik, said the attackers targeted a citizen during the mass.

“Our security forces are conducting a large-scale investigation into the matter,” Celik said. “Those who threaten the peace and security of our citizens will never achieve their goals.”