Saturday marked one year since 26 people, including 20 children, were killed in a mass shooting in Newtown, Connecticut.
Last year, 20-year old Adam Lanza killed his mother in their home before going on a rampage at Sandy Hook Elementary School that ended when he took his own life.
A recent report by Connecticut investigators noted Lanza's mental health issues and obsession with other school shootings, but did not find a specific motive for the killings.
The White House observed a moment of silence Saturday morning.
President Barack Obama and First Lady Michelle Obama lit candles in honor of the 26 victims.
Newtown itself has no public ceremonies planned and has asked the media to stay away out of respect for the victims' families.
Instead, officials are asking people to honor the victims with acts of kindness in their own communities.
Meanwhile, in his weekly address, Obama said that while some progress has been made on gun control since the shootings, it's up to ordinary citizens to push for change to ensure that senseless killings come to an end.
"We haven't yet done enough to make our communities and our countries safer. We have to do more to keep dangerous people from getting their hands on a gun so easily. We have to do more to heal troubled minds. We have to do everything we can to protect our children from harm, and make them feel loved and valued and cared for,” said Obama.
The president also praised the families of the 26 people killed in Newtown for leading the fight for tighter gun control.