Two people were killed and six others were wounded in a mass shooting at a music festival after-party in downtown Los Angeles early on Monday, officials said.

The gathering had been promoted as an unofficial after-party for Hard Summer, a house- and techno-music festival taking place over the weekend at Hollywood Park.

Gunfire erupted during a party in a warehouse district of downtown Los Angeles, killing two people and wounding six others early Monday, authorities said. Authorities first responded around 11 p.m. Sunday to shut down a “big party” after officers saw a person possibly armed with a gun go inside a building,