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) 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) 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) 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.
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