Following the shootings at two Jewish community centers that left three people dead Sunday in Kansas City, President Barack Obama grieved for the victims' families Monday and called on the American public to stand up against religious bigotry.

During the White House's annual Easter prayer breakfast that gathered religious leaders, Obama said the U.S. government would provide any investigate support to the local authorities, the Los Angeles Times reported.

"Nobody should have to worry about their security when gathering with their fellow believers," Obama lamented. "No one should ever have to fear for their safety when they go to pray. And as a government, we're going to provide whatever assistance is needed to support the investigation."

Police arrested 73-year-old Frazier Glenn Miller of Missouri for allegedly killing the three victims after opening fire at a Jewish community center and a nearby retirement community, Fox News reported.

According to the Southern Poverty Law Center, Miller was a founder of the Carolina Knights of the Ku Klux Klan in the 1980s and also founded another white supremacist group, the White Patriot Party. He has been involved in the white supremacist movement for nearly all of his life and held the "grand dragon" position for his KKK faction.

Sunday, celebrated as Palm Sunday, marked the beginning of the Holy Week for Roman Catholic and Christian churches and the start of Passover for Jewish communities.

"That his occurred now, as Jews were preparing to celebrate Passover, as Christians were observing Palm Sunday, makes this tragedy all the more painful," Obama said.

The president asked that all religious leaders "keep coming together across faiths to combat the ignorance and intolerance, including anti-Semitism, that can lead to hatred and to violence," during Monday's breakfast.

Obama also recalled his meeting with Pope Francis during his recent visit to Vatican City. He said Francis inspired him for his advocacy for economic, religious and social equality.

"He implores us to see the inherent dignity in each human being. But it's also his deeds, simple yet profound, hugging the homeless man or washing the feet of somebody who, normally, ordinary folks would just pass by on the street," Obama admitted. "He reminds us that all of us, no matter what our station, have an obligation to live righteously and that we all have an obligation to live humbly, because that's, in fact, the example that we profess to follow."