Closing Bell: Apple Opens Siri to Third Parties; U.S. Stocks Slide

U.S. stocks ended at session lows in a disappointing start to the week.
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U.S. stocks ended at session lows in a disappointing start to the week. The Federal Reserve's June meeting, which kicks off on Tuesday, loomed large, while oil endured its third straight session in decline. Apple's (AAPL) - Get Report  digital assistant Siri has been expanded to use on Macs. The tech giant also offered up Siri to app developers, allowing voice-command tech to be integrated into third-party apps. Marinus Pharmaceuticals (MRNS) - Get Report  slumped after a late-stage drug trial for epilepsy failed to meet its goals. The treatment was designed for adults who suffered from drug-resistant seizures. Gunmakers including Smith Wesson (SWHC)  and Sturm, Ruger Co. (RGR) - Get Report  closed higher in the wake of the weekend's shooting in Orlando. The attack of a nightclub proved the deadliest shooting in modern U.S. history with nearly 50 fatalities. TheStreet's Keris Lahiff reports from Wall Street.