President Barack Obama is observing the anniversary of the Boston Marathon bombing with a moment of silence at the White House.
The president plans to make the remembrance privately Tuesday with aides in the Oval Office. The moment of silence is planned for 2:49 p.m., the same time two bombs exploded near the finish line of the marathon last April 15.
The attack killed three and wounded hundreds.
Vice President Joe Biden and his wife, Jill, are attending a memorial service at Boston's Hynes Convention Center. Biden's office says he will deliver remarks in tribute to victims of the bombing, as well as the survivors and first responders.
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