A mass shooting incident at an apparent after-party in Los Angeles in the US left at least two people dead and six others injured, media reports said.

Around 11 p.m. Sunday, officers saw someone run into a location that appeared to be a party with about 50 to 60 people in attendance, Los Angeles Police Department commanding officer Letisia Ruiz told ABC News.

One person was arrested for possession of a firearm, police told the news channel, and officers locked down the scene, cleared it and left for another call.

Then, around 1 a.m. Monday, police received a radio call for shots fired, and officers responded to the location again and found several people struck by gunfire, Ruiz said.

Police said all the victims were adults.

The motive of the attack is still not clear.

A Los Angeles Police Department spokesperson told KTLA 5’s Erin Myers early Monday morning that, in addition to the two decedents, six people were injured – including at least one in critical condition.

The identities of the victims are still not known.