A shooting erupted during a music festival after-party in downtown Los Angeles, killing two people and wounding six others early Monday, authorities said.Authorities first responded around 11pm Sunday to shut down a “big party” after officers saw a person possibly armed with a gun go inside a building in a downtown warehouse district, said Officer Norma Eisenman. That person was arrested at the scene, she said.The party had been promoted on social media as an unofficial after-party for Hard Summer, a weekend techno-music festival held at Hollywood Park, about 14km (9 miles) away in Inglewood, KTLA-TV reported.Shortly after officers had cleared the area, police received a report of shots fired around 1am. When the officers returned, they found one person dead and learned multiple people had been struck by gunfire, Eisenman said in an email.A male victim died at the scene and a female victim died at a hospital, Eisenman said. Six people were taken to hospitals in unknown condition, she said.A man told KABC-TV that his 29-year-old son was one of the two people killed.