Police say two people have been arrested after a person was killed in the Arrowhead Stadium parking lot.

Details have not been released, but Police Chief Darryl Forte tweeted about the incident Sunday night on Twitter. Forte said the death is being investigated as a homicide and that two suspects are in custody.

Flashing emergency lights could be seen outside the stadium after the incident.

The Chiefs lost to the Denver Broncos, 35-28, on Sunday at the stadium in Kansas City. It isn’t clear if the incident involved fans who had been at the game.

Kansas City Chiefs spokesman Ted Crews says the team is aware of the incident but could not comment any further because of the ongoing police investigation.