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A Bushmaster AR-15 assault rifle. Photo: AFP

Latest US mass shootings all have something in common: the AR-15 Bushmaster assault rifle

But there’s one thing that does make the latest massacre unusual. Of the 10-deadliest mass shootings, Nikolas Cruz is the only suspected gunman to escape, survive and likely face trial

When a gunman attacked a high school in Parkland, Florida on Wednesday, killing 17 people, the event marked a depressingly familiar milestone.

As of this week, seven of the 10 deadliest mass shootings in modern US history have all happened since 2007. The Parkland massacre is now the eight-deadliest attack.

The nation’s mass-shooting problem seems to be getting worse. And the latest, most serious shootings all seem to have one new thing in common: the AR-15 semi-automatic assault rifle.

The AR-15 that typically has large magazines, shoots rounds at higher velocities than handguns, and leaves more complex wounds in victims.

In each one of the older shootings on the 10-deadliest list – including the 2007 attack on Virginia Tech in Blacksburg, Virginia, that left 32 victims dead – the gunmen carried handguns. (The exception is the 1984 San Ysidro, California, massacre, where the gunman also used a shotgun and an Uzi semi-automatic carbine).

But in all of the latest incidents – Newtown, Connecticut, in 2012; San Bernardino, California, in 2015; Orlando, Florida, in 2016; Las Vegas, 2017; Sutherland Springs, Texas, 2017 -the attackers primarily used AR-15 semi-automatic rifles.

There are a couple of theories that might suggest why AR-15s would be associated with deadlier attacks. AR-15 rifles shoot small but high-velocity .223-calibre rounds that often shatter inside victims’ bodies, creating more devastating injuries than the wounds typically left by larger but lower-velocity handgun rounds.

Two SWAT officers at Marjory Stoneman Douglas High School after the shooting in Parkland, Florida. Photo: EPA

Gunmen also commonly use the rifles with 30-round magazines, which allow a gunman to fire more rounds uninterrupted, compared to the smaller magazines commonly used in handguns.

Details were still coming in about Wednesday’s shooting in Florida, but officials say the suspected gunman, Nikolas Cruz, 19, was armed with at least one AR-15 semi-automatic rifle and “countless magazines,” according to Broward County Sheriff Scott Israel.

There’s one thing that does make the Parkland massacre unusual. Of the 10-deadliest mass shootings, Cruz is the only suspected gunman to escape, survive and likely face trial – giving the public a chance to learn why the massacre happened.

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