NFL AMERICAN FOOTBALL:THE PITTSBURGH Steelers, last season's Super Bowl champions, were shocked 27-24 in overtime by the Kansas City Chiefs at Arrowhead Stadium on Sunday.

Ryan Succop kicked the game-winning 22-yard field goal in overtime.

“They are the Super Bowl champions and they are an organisation to be and try and get to,” said Chiefs quarterback Matt Cassell, who set up the winning field goal with a 61-yard completion to Chris Chambers.

“To come out here and get a big win is huge, for not only this team, but also this organisation.”

Kansas City’s defence forced three turnovers, including two interceptions by linebacker Andy Studebaker.

“I take responsibility for that performance,” Steelers coach Mike Tomlin said. “I have to have this football team better prepared to play. Ultimately we have to play better than what we played in that stadium. We are capable of much more than that. You have to tip your hat to the Chiefs because they played well enough to win.

“But that’s not what we’re capable of. That’s not us, and it won’t be us. But it was us today.”

Steelers quarterback Ben Roethlisberger completed 32 of 42 passes for 398 yards and three touchdowns, but was removed from the game in overtime after taking a knee to the head.

Pittsburgh remained a game behind the Cincinnati Bengals in the AFC North after the Bengals were stunned by the Oakland Raiders 20-17. Kansas City improved to 3-7.

The Indianapolis Colts improved to a perfect 10-0 record with a 17-15 win over the Baltimore Ravens on Sunday. Peyton Manning threw for 299 yards and a touchdown and Joseph Addai rushed for 74 yards and a touchdown as Indianapolis won their 19th consecutive regular season game stretching back into last season. The Colts now have the second longest streak in the NFL behind the New England Patriots, who won 21 games in a row between 2006-2008.

The Colts needed an inspired effort from their defence to finally subdue the Ravens.