The Orlando mass shooting is different from the terrorist attacks in Brussels, Paris and San Bernardino, California. Different also from the massacre at Sandy Hook Elementary School in Newtown, Connecticut, or the multiplex movie theater in Aurora, Colorado, or the Virginia Tech mass shooting in Blacksburg, Virginia.

People attend a vigil in memory of victims one day after a mass shooting at the Pulse gay night club in Orlando, in Los Angeles, California, June 13, 2016. REUTERS/Lucy Nicholson

When Omar Mateen killed at least 49 people and wounded more than 50 others early Sunday at the Pulse nightclub in Orlando, Florida, the victims were not a random group of people sharing the same physical space. They were all part of the lesbian, gay, bisexual and transgender community.

With this, the Orlando massacre could prove to be a turning point in the gun-control debate. Mateen may have cemented an alliance between gun-regulation advocacy groups and the well-organized LGBT social movement. It could catalyze the mobilization of a united front that expands the political and social reach critical for passing meaningful gun regulations.

As a criminologist, I have reviewed and written many studies on mass shootings, and Orlando stands out because of the convergence of four key characteristics. First, it is the most deadly mass shooting in U.S. history (the deadliest overall was committed in Norway in 2011, where 77 people were killed). Second, the crime was carried out with assault-type weapons (the AR-15). Third, the shooter, law enforcement authorities say, pledged allegiance to Islamic State during the attack. Fourth, and most crucial, the attack singled out a specific community and appears largely motivated by sexual prejudice, which, by definition, becomes a hate crime.

These four characteristics have never before combined in any one U.S. mass shooting. The horrific 2015 attack at the African Methodist Episcopal Church in Charleston, South Carolina, for example, was categorized as a hate crime. But it was not connected to any jihadist ideology. The confessed shooter, Dylan Roof, did not use military-style weapons, and fewer than 10 people were killed. The same components apply to mass shootings that occurred in other religious sites,, such as the 1991 attack on a Buddhist temple in Arizona.

The mass shooting in Orlando provides a unique opportunity to shift the burden of proof about the necessity for stronger gun-control regulation. First, it is critical to acknowledge that the majority of mass shooters have been marked by mental health issues, social alienation or work disgruntlement. They had a variety of personal motivations, often not aimed at weakening government legitimacy, which is what motivates groups like Islamic State or al Qaeda. The most frequent motivations are revenge or a quest for power.

Orlando fits the pattern of Islamic State-inspired shootings that seek to spread fear and portray the U.S. government’s counterterrorism strategy as ineffective. In addition, Islamic State has pointed out to possible recruits that they should take advantage of the Second Amendment right to bear arms, which a majority of Americans view as a fundamental constitutional pillar.

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Yet, this right to bear arms could pose a serious national-security vulnerability because it provides violent extremists the same legal protections that American citizens enjoy. The result? The lack of tough gun regulations makes it easier for Islamic State recruits to kill Americans at home or stage mass shootings abroad with assault-type weapons bought legally.

After the attacks in San Bernardino and Orlando, the public could press Congress to acknowledge that weak firearm regulation is a serious breach in the protection of the homeland against domestic and foreign aggressors.

After all, this wouldn’t be the first time that U.S national security was used as a reason to restrict constitutional rights. After 9/11, the American people gave up more than a few constitutional rights when the Bush administration, under the USA Patriot Act and various presidential directives, weakened civil liberties for the sake of bolstering U.S. security.

One of the most controversial breaches of fundamental constitutional rights permitted the National Security Agency to turn its signal interception inward and spy on the American people without first obtaining legal warrants.

Public calls to regulate firearms for national-security reasons and possibly save more American lives – despite Second Amendment rights -- should not come as a surprise.

To improve homeland security, the argument goes, U.S. citizens would be better protected if more restrictive background checks were performed and if people were required to prove “good character.” This could include not belonging to any group “prohibited” from owning firearms -- the mentally ill, for example, or criminals or terror suspects (like Mateen). It should also include people deemed high risk for committing violent crime, such as individuals with a police record for threatening the life of another.

In attacking the Pulse nightclub, a well-known LGBT gathering spot, Mateen took aim at a community with an estimated 9 million members across the United States. For more than 20 years, the LGBT community has mobilized into a powerful social movement that has demonstrated its ability to successfully advocate for a broad range of rights.

In previous mass shootings, because the victims and their families were not linked by any specific bond, such as identity or social-movement involvement, a cohesive mobilization to advocate for stricter gun regulations was often complicated and difficult.

The unique characteristics of the Orlando mass shooting, however, could influence passage of meaningful gun-control reform in Congress. Something even the tragedy of 20 dead first-graders at Sandy Hook could not bring about.

The LGBT community was targeted with unprecedented violence in Orlando. This media-savvy community led the 20-year cultural shift in how Americans view gay people and gay marriage, one of the most successful social-justice movements of modern times.

Combining the LBGT community with national- security demands for stricter control of gun sales well could create the momentum needed to propel Congress to act.