https://www.bbc.com/news/world-us-canada-61772039
Thousands of protesters are gathering across the US to call for stricter gun laws in the wake of last month's mass shooting in Texas.
Gun safety group March For Our Lives - founded by survivors of the 2018 Parkland school shooting - said some 450 rallies were planned for Saturday.
It said it would not let politicians "sit back" as people continue to die.
US President Joe Biden backed the protests, calling on Congress to "pass common sense gun safety legislation".
Nineteen children and two adults were killed in the 24 May shooting at Robb Elementary in Uvalde, Texas.
That attack, and another days earlier in Buffalo, New York, in which 10 people were killed, has led to renewed calls for action on gun control in the US.
Girls at March For Our Lives demonstration in Washington
March For Our Lives (MFOL) said political leaders' inaction was killing Americans.
"We will no longer allow you to sit back while people continue to die," Trevon Bosley, a MFOL board member, said in a statement.
Speaking to protesters in Washington DC, one of the survivors of the Parkland shooting, David Hogg, said the killings of children in Uvalde "should fill us with rage and demands for change, not endless debate, but demands for change, now."
Garnell Whitfield, whose 86-year-old mother was killed in the racially-motivated shooting in Buffalo, New York on 14 May, told crowds in Washington: "We are here to demand justice.
"We are here to stand with those who are bold enough to demand sensible gun legislation."
Among other policies, MFOL has called for an assault weapons ban, universal background checks for those trying to purchase guns and a national licensing system, which would register gun owners.
Rallies are being held in cities including Washington, New York, Los Angeles and Chicago.
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