U.S. financial markets climbed to new records on Monday, Oct. 2, despite concerns over a mass shooting in Las Vegas that officials called the worst in the country's history and President Donald Trump described as an "act of pure evil."

While it's always a touchy subject -- TheStreet delved into some companies that are providing technology that can actually help prevent (or at least help solve) such events. Among them, ShotSpotter Inc. (SSTI)  jumped on Monday as the company is one of the main players behind systems to detect the origin of gunshots for police.

The systems are increasingly part of smart-city technology deployments by companies such as General Electric Co. (GE)  and AT&T Inc. (T) in cities, airports and other environments.

Amid the hustle of bustle of the first trading day of October that was clouded with the Las Vegas shooting news, the latest in the way of inversion deals went relatively unnoticed.

The U.S. District Court for Western Texas in Austin has ruled that the Obama administration acted unlawfully when it issued so-called "serial inverter" regulations. The regulation was the main catalyst behind the demise of Pfizer Inc.'s (PFE)  $160 billion deal for Allergan plc (AGN)  , and the ruling could open the door for the pharmaceutical companies to give a combination another go.

To be sure, it is unclear whether Pfizer and Allergan would be interested in reigniting merger talks. Pfizer paid Allergan a $400 million fee when the deal fell apart. Not to mention that Allergan on Sept. 25 announced that its CFO, Tessa Hilad, plans to retire at the end of 2017 on top of a number of other capital allocation changes.

For Pfizer, other acquisition targets may look more attractive, especially considering Allergan's $30 billion debt pile. Most recently, U.K.-based Astrazeneca plc (AZN)  was rumored to be a potential target for Pfizer.

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Photo of the day: Remembering "Mr. October"

It's the first trading day of October and TheStreet is out with the latest installment of "Trading Strategies," our monthly special report bringing you the best ideas from our top columnists. It's only fitting that today we feature Mr. October himself -- Reggie Jackson -- who is pictured above in front of his locker at Yankee Stadium during the 1977 World Series. During this Series, played between the Yankee and Los Angeles Dodgers, Jackson earned his nickname "Mr. October" for his heroics, including a three home run game 6 to clinch the series. If you want to be a Mr. (or Mrs.) October just like Jackson, tune into the latest advice from TheStreet for the month of October.

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