Nearly one month after one of the deadliest attacks against Iraqi Christians, Iraq made its first arrests, an interior ministry official said Saturday.

The official, who spoke to Agence France-Presse on the condition of anonymity, said 12 members of the group responsible for the Oct. 31 church siege in Baghdad have been arrested.

The Sunni militant group Islamic State of Iraq has claimed responsibility for the attack against believers at Our Lady of Salvation, Baghdad's main Catholic church. Militants had stormed the church during mass wearing suicide vests and taking about 120 churchgoers hostage. Nearly 60 people, mainly worshippers, were killed. More were wounded.

Since then, anti-Christian bombings have continued.

Church leaders and the international community have condemned the attacks.

U.S. National Security spokesman Mike Hammer said in a statement that the United States strongly condemns the terrorist attacks in Iraq and offered condolences to the victims' families.

Pope Benedict XVI called the attack "absurd" and the World Council of Churches also denounced the violence.

Meanwhile, human rights watchdogs say extremists are focused on eliminating Christianity from Iraq.

"I’m using the word religion-cide to explain to people what is really taking place in Iraq right now," said Carl Moeller, president of Open Doors USA.

The U.N. High Commission for Refugees estimated last year that since the U.S.-led invasion of Iraq in 2003, up to 500,000 Christians had left the country. Previously, around 1.2 million Christians lived in Iraq.