President Obama will observe a moment of silence at 9:30 a.m. today at the White House, marking one week since a lone gunman opened fire in a Connecticut elementary school, killing 20 first graders before turning a gun on himself.

And he pledged in a video that he’d do everything in his power as president to address safety, mental health issues and the culture of violence that may have contributed to the tragedy.

“If there’s even one thing we can do as a country to protect our children, we have a responsibility to try,” the president said.

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