Student survivors of last month's shooting at a school in Parkland, Florida are set to join thousands others in Washington in what is expected to be their biggest demonstration yet to demand reforms in gun laws.
The Parkland school shooting that killed 17 students and staff last month has revitalised the debate over gun ownership across the US.
Ten people were also injured when a newly installed 950-tonne pedestrian bridge collapsed, trapping at least eight cars below, officials say.
Nikolas Cruz has been indicted on 17 counts of premeditated murder in the first degree and 17 counts of attempted murder, but its the calls to 911 that reveal much of that tragic day.
Florida state lawmakers give final passage to a gun-safety package that raises the legal age for buying rifles and imposes a three-day waiting period on all firearms sales, while also allowing the arming of some public school personnel.
US President Donald Trump's remarks came after he had criticised an armed deputy for not confronting the suspect in the February 14 mass shooting, calling him a "coward."
The passage of the bill appears to mark the first time a state legislature has passed a gun-control measure since the Parkland school shooting. Opponents say the law would violate Second Amendment protections on the right to bear arms.
Trump tweeted his strong stance one day after an emotional White House session where victims of the Florida school shooting told wrenching tales of lost lives and pleaded for action.
President Donald Trump's decision comes as pressure mounts on the US administration to take action after last week's shooting at a Florida High School killed 17 people.
There have been renewed calls for stricter gun control in the United States following the shooting deaths last week of 14 students and three adults at a Florida high school.
From the same pad where NASA launched rockets that carried astronauts to the moon, the Falcon Heavy arced into space.
A gunman shooting from a hotel in Las Vegas Strip has killed at least 50 people, making the shooting the deadliest in American history.
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