"What we're also seeing, more disturbingly, is the increase in the severity of violence," said Sharon Stapel, executive director of the New York City Anti-Violence Project, which coordinates coalition.

Stapel theorized that at least some of last year's violence was backlash against issues that arose during the during the presidential campaign. She cited debates about same-sex marriage, the military's "don't ask, don't tell" policy, and federal legislation that would ban employment discrimination based on sexual orientation and gender identity as possible flash points.

"The more visibility there is the more likely we're going to see backlash, and that's exactly what we see here," Stapel said.