The mass shooting Sunday evening on the Las Vegas Strip has once again turned the nation’s attention to the one common denominator in these American tragedies:

Guns.

Early reports indicate that the gunman, identified as 64-year-old Stephen Paddock, opened fire on a concert crowd from his room at the Mandalay Bay Hotel and Casino, killing at least 58 people before taking his own life, and leaving behind 10 rifles. Calling the shooter a “lone wolf,” authorities said Monday morning that they believe Paddock may have used multiple guns to shoot his victims, county-music fans gathered in a field across the street below.

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Until police release more details about the gunman, it’s unclear which, if any, of the guns he used were legal, how he may have obtained them, and whether any had been modified to be used as fully automatic weapons.

In the meantime, the tragedy rekindled the debate over firearms in America and how to control them .

Heartbroken by the lives lost.

Heartbroken for their families.

Heartbroken that we can’t pass commonsense gun laws in our nation. — Gavin Newsom (@GavinNewsom) October 2, 2017

Here are some things we know about gun laws in Nevada:

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Nevada has some of the least restrictive gun laws in the country;

The state does not require firearms owners to have licenses or register their weapons and Nevada does not limit the number of firearms an individual can possess;

Semi-automatic assault-style weapons and machine guns are legal in the state as long as they are possessed in adherence to federal law, according to the National Rifle Association;

Nevada also does not outlaw the transfer or possession of 50-caliber rifles or large-capacity ammunition magazines;

The Nevada state legislature has prohibited cities and counties from passing their own regulations on firearms, effectively reserving for itself the right to legislate all areas of firearm law except unsafe discharge of firearms;

The state’s gun-control activists won a small victory last year by passing Question 1, a resolution that called for background checks through a licensed gun dealer for all sales in the state.

The measure also required an unlicensed person who wishes to sell or transfer a firearm to another person to conduct the transfer through a licensed gun dealer who runs a background check. But Nevada Attorney General Adam Laxalt later issued an opinion that that part of the law is unenforceable;

Open carry is legal in the state, without a permit;

According to the website Nevada Open Carry, whose website early Monday announced that “a hateful heart was responsible for this crime,” you can carry guns openly everywhere, with a handful of exceptions such as in a child care facility or public school without written permission of the principal.

Nevada’s open-carry policies do not allow weapons to be displayed on federal properties including courthouses and Social Security offices, post offices and military bases. Other states, including California, Florida and Illinois, have bans on open carry, while states including Minnesota and New Jersey, require a permit to openly carry a long gun;

Local law enforcement issues concealed handgun licenses in Nevada. Nevada is a so-called “shall issue” state, meaning the county sheriff shall issue a concealed firearms permit to applicants who qualify under state and federal law;

While Nevada considers concealing a firearm without a permit to be a felony, it is possible to obtain a concealed firearm permit by taking an eight-hour concealed firearm permit course approved by the sheriff; it’s not clear whether the Vegas gunman possessed such a permit;

If you are moving to Nevada and have an out-of-state permit, you must apply for a resident permit from scratch, including taking the training class;

Nevada does not require a license for the sale of ammunition or require sellers of ammunition to maintain a record of the purchasers;

Nevada does prohibit the manufacture or sale of any “metal-penetrating bullet” capable of being fired from a handgun;

Under state law, a person may not sell ammunition to another person if the seller has “actual knowledge” that the person: is under indictment for, or has been convicted of, a felony in Nevada, any other state, or under federal law; is a fugitive from justice; has been adjudicated as mentally ill or has been committed to any mental health facility;

Although federal law prohibits the possession of newly manufactured machine (automatic) guns, it allows the transfer of machine guns lawfully owned prior to May 19, 1986, if the transfer is approved by Bureau of Alcohol, Tobacco, Firearms & Explosives (ATF);

A substantial number of machine guns are still in circulation — as of November 2006, the national registry of machine guns contained registrations for 391,532 of them.

While police have not said what kind of weapons the gunman used, videos from the scene suggest Paddock used either an automatic or semi-automatic firearm.

News reports said that in some videos of the shooting, the sound of the gunfire seems inconsistent or perhaps sputtering, which could mean the weapon had been modified to fire faster; the rate of firing also suggest something call “bump firing,” which is the act of using the recoil of a modified semi-automatic firearm to fire shots in rapid succession, thus simulating the feeling of a fully automatic weapon;

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The duration of the gunfire bursts also suggest that if the shooter had military or some kind of formal firearm training, he did not put it into use because conventional military training dictates the shooter use brief, controlled bursts of fire, not extended bursts like those heard in the Vegas shooting.