The NRA's suggestion that "big" doctors who support the ban on semi-automatic weapons should "stay in their lane" ignited on social media after a doctor was killed shot in a Chicago hospital late Monday.

"You know who are still at work? The doctors and staff of the Mercy Hospital in Chicago, IL, during and after a violent attack, because literally #ThisIsOurLane," tweeted doctor Shelley Sahu, a hematologist at the National Institutes of Health.

Peter Masiakos, pediatric surgeon from Boston on Twitter: "The way crosses our hospitals. @ThisIsOurLane"

Tamara O 'Neal, emergency room doctor, Dayna Less, resident of the pharmacy, and Samuel Jimenez, Chicago police officer, were shot dead at Mercy Hospital, in the southern district from the city, by a former fiancé from O. Neal, police said. The gunman, identified by family members as Juan Lopez, 32, also died in the carnage.

The shooting took place less than two weeks after the NRA used social media to criticize the American College of Physicians and the professional journal Annals of Internal Medicine for publishing a series of articles supporting stricter laws on firearms.

"Someone should tell the important anti-gun doctors to stay in their hallway," NRA said in his tweet. "Half of the articles in Annals of Internal Medicine insist on gun control."

More: A policeman among the 4 dead in a "horrible" shootout & # 39; at the Chicago Hospital

More: Health Professionals at ANR: Firearms are our way

The NRA says the newspaper is based on erroneous evidence.

"Let me guess, @NRA, still not" our way "even when it's happening in our own hospitals?" tweeted Emil Fernando, Chicago surgeon. "I do not think so. #EndGunViolence @ThisIsOurLane @Chicago_Police @MercyChicago @GunDeaths"

Elizabeth Stephenson, a cardiologist at Toronto's Hospital for Sick Children, tweeted: "#ThisisOurLane when bullets kill our patients #ThisisOurLane when bullets kill our family – and make no mistake – she was our family, if we had the chance to know it or not. @choo_ek @ThisIsOurLane "

Teresa Sellers, who cares for patients with dementia, was more pointed. "Maybe the NRA can wipe the blood and hold the hand of the innocent while he dies … and understand the reality of the track that is being discussed," he said. she tweeted. "Hell Fire, the world is fed up that we're still like cowboys!"

Houston surgeon Joseph Mills tweeted: "Even in times of war, hospitals are supposed to be banned.It's time to take a deep breath and re-examine the American public consciousness @USSenate @USHouseofReps #EndGunViolence #ThisIsMyLane @ThisIsOurLane @MomsDemand @choo_ek @JosephSakran @scrubbedin

Eugene Gu, a politically active surgeon who has already sued President Donald Trump, tweeted: "The ANR told the doctors to stay in their hallway and there is now a shootout at Chicago's Mercy Hospital. Doctors can also be patients and victims of armed violence. " All together, as human beings who just want to live and return home to their families. Enough is enough. "

Gu's tweet has been retweeted more than 17,000 times.

"There is no worse horror for a doctor than operating a colleague who was shot dead, or declaring your friend dead, but for the doctors, patients and first responders at Mercy Hospital, it's their way, "Gu tweeted later.

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