WASHINGTON - More than 100 people gathered outside the 7th District police station in Southeast D.C. after a police officer shot and killed an 18-year-old on Orange Street on Wednesday.READ MORE: Officer shot and killed person in Southeast DC, police sayOrganizers have issued a call for additional protesters on Thursday morning.According to police, the man was shot during an investigation into an armed man, and two guns were found at the scene.Download the FOX 5 DC News App for Local Breaking News and WeatherAdvertisementPolice say Deion Kay pulled out a gun before the officer shot him.The shooting arrives in the midst of nationwide unrest over police violence.The officer who shot Kay has not been identified.Police say they are.