Kansas City: Peyton Manning tossed three touchdown passes and Bradley Roby scored off a late fumble as the Denver Broncos completed a stunning comeback with a 31-24 win over the Kansas City Chiefs on Thursday.

Five-time NFL MVP Manning completed 26-of-45 passes for 256 yards including two touchdown passes to receiver Emmanuel Sanders for the Broncos, who engineered a dramatic about face after the Chiefs had taken a seven-point lead with 2:27 left in the fourth quarter.

“That was a new one for me,” said Manning. “I’ve been in a couple of crazy games but never one quite like that.”

Denver got off to a poor start and trailed by 14 points at one stage of the second quarter before quarterback Manning started to pick apart the Chiefs’ secondary.

Manning, who surpassed the 70,000 NFL career passing yard mark in the fourth quarter, hit Sanders with touchdown passes of 16 and 19 yards and also found Virgil Green down the middle for a one-yard score.

“This is one you always remember,” Manning said.

Manning now has 70,122 passing yards and is second on the all-time list behind Brett Favre, who has 71,838.

The Chiefs appeared to be headed to just their second victory in 15 tries against Manning when the wheels suddenly fell off.

Manning connected with Sanders with 36 seconds left in the fourth on third down to tie the game 24-24.

Then, with 27 seconds left, linebacker Brandon Marshall forced a Jamaal Charles fumble and cornerback Roby scooped up the ball and ran for a 21-yard touchdown to give the Broncos the victory at Arrowhead Stadium.

“I was just trying to make a play and wasn’t careful with the ball,” said Charles, who had two fumbles in the contest. “I tried to put the team on my back and I ended up losing the game. It’s all on me tonight.”

Sanders finished with eight catches for 87 yards and a pair of touchdowns, while wide receiver Demaryius Thomas caught eight passes for 116 yards for Denver.

Charles had 21 carries for 125 yards for the Chiefs, who were coming off a 27-20 win over Houston in their season opener last Sunday.

Kansas City’s defence gave up 2.8 yards per carry (61 rushing yards) and held the Broncos to less than 300 yards (299).

“We could have all done better,” Chiefs coach Andy Reid said. “We win as a team and we lose as a team.”

After spinning their tires in a scoreless first quarter, Denver began to put together consistent first downs when Manning went to shotgun snaps with three wide receivers. Broncos coach Gary Kubiak was upset with their slow start.

“I don’t know if I’ve ever been so mad in my life,” Kubiak said. “I said a lot of things I wouldn’t want people to hear.”