[简答]  12PeopleKilled,50InjuredinDenverMovieTheaterShootingLOSANGELES,July20(Xinhua)--AmaskedgunmanreleasedteargasandopenedfireintoacrowdedmovietheaterinasuburbofDenverearlyFriday,killing12peopleandinjuringatleast50others,policesaid.AuroraPoliceChiefDanOatestoldreportersthattheshooter,aged24,hadbeenarrestedintheparkinglotbehindthetheater.TheFBIsaidtherewassofarnoindicationofanylinkstoterrorgroups.Somemoviegoerssaidtheythoughttheattackwaspartoftheshowwhentheysawapersonappearingatthefrontofthetheaterduringthemovie,pointingagunatthecrowd.Policeandfirefightersrushedtothemallshortlyaftertheshootingsoccurredataround12:30a.m.localtime(0630GMT).CNNreportedatleast20peoplewerebeingtreatedforgunshotwoundsinhospital,threeoftheminseriouscondition. 2.Theshooterwasarrested.3.TheFBIsaidthattheshooterwasfromtheterrorgroups. 4.Themoviegoersdidn’trealizethepersonwouldshootatthecrowdatfirst. 5.Onlythepolicewenttothemalltohelp.