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Police have arrested a second suspect in connection to a mass shooting in downtown Sacramento, California, this weekend that left six people dead and a chaotic crime scene littered with more than 100 shell casings. Smiley Martin, 27, who was taken into police custody Tuesday, was found at the scene of the shooting early Sunday with "serious injuries from gunfire" and taken to a local hospital, the Sacramento Police Department said in a news release. Police "quickly identified" him as a "person of interest" and kept him under police supervision at the hospital, the release said. According to police, Smiley Martin is the brother of Dandrae Martin, another suspect arrested Monday in connection to the shooting, which also left 12 people wounded and was one of more than 120 mass shootings in the United States this year and one of at least 10 shooting incidents over the weekend.