On February 14, 2018, Nikolas Cruz, who was 19 at the time, took a legally purchased AR-15 assault rifle into Marjory Stoneman Douglas High School, and began shooting randomly at people.
The number of mass shootings have jumped 65 percent in the first six months of 2021 compared to pre-pandemic levels in 2019.
Gun sales and a mental health crisis among young people, both of which spiked during virus-related lockdowns, are seen as risk factors in school shootings.
Supreme Court agrees to hear a challenge backed by National Rifle Association to New York state's restrictions on people carrying concealed handguns outside the home.
Tighter gun control is overwhelmingly popular with Americans, and championed by Biden's Democrats, but Republicans have long stood against what a minority view as any infringement on their right to bear arms.
Australian white supremacist Brenton Tarrant admits murders of 51 Muslim worshippers last March in Christchurch city, in a surprise change of mind, police say.
Authorities are searching for the perpetrators early Thursday, three hours after the shootings which took place at two shisha bars in Hanau.
In all, there were 41 incidents this year in which four or more people were killed, resulting in more than 210 deaths. Of those, 33 were mass shootings.
The shooting inside a waiting room is the worst such incident to take place in the Czech Republic since 2015 when a man shot eight people dead at a restaurant in Uhersky Brod.
How white supremacist mass murders have become an organised transnational security threat.
President Donald Trump calls for urgent action to prevent gun violence after mass shootings in Texas and Ohio killed 29 people and wounded dozens. He says the US "must condemn racism, bigotry and white supremacy."
"God Control" features a graphic nightclub shooting, calling people to "wake up" to the reality of arms ownership and use.
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