Hundreds of people gathered Sunday at prayer vigils and in church, in frustration and exhaustion, to mourn yet another racist attack in America: this one the killing of three Black people in Florida at the hands of a white, 21-year-old man who authorities say left behind white supremacist ramblings that read like “the diary of a madman.”

Following services earlier in the day, about 200 people showed up at a Sunday evening vigil a block from the Dollar General store in Jacksonville where officials said Ryan Palmeter opened fire Saturday using guns he bought legally despite a past involuntary commitment for a mental health exam.

Republican Gov. Ron DeSantis — who is running for the GOP nomination for president, who has loosened gun laws in Florida and who has antagonized civil rights leaders by deriding “wokeness " — was loudly booed as he addressed the vigil.