Kansas City Chiefs suffer first loss while Pittsburgh Steelers march on

The Kansas City Chiefs suffered their first defeat of the season at the hands of the Las Vegas Raiders (Charlie Riedel/AP)

The Kansas City Chiefs suffered their first defeat of the NFL season as they fell 40-32 to the Las Vegas Raiders.

The Raiders had lost seven straight at Arrowhead previously, and 10 of their last 11 meetings with the reigning Super Bowl champions.