Two people were shot, one man was arrested, and officers recovered a gun after six separate shootings over the weekend. Saturday evening at about 6:00 p.m., a witness flagged an officer down in the Chinatown-International District and told him someone had been shot at 12th Avenue South and South Jackson Street. Police responded to the scene and found a shell casing and several blood droplets, but no victim. None of the people in the area claimed to have seen or heard anything, and no suspect description was provided. Later that night at about 11:00 p.m., a man in the 400 block of Dexter Avenue…