Kendrick Lewis and Brandon Flowers each returned one of Kansas City's six interceptions for a touchdown as the Chiefs spoiled the Oakland debut of Carson Palmer and extended their winning streak to three games with a 28-0 road victory over the Raiders on Sunday.

Oakland (4-3) also lost running back Darren McFadden, who left with a sprained right foot early in the first half. McFadden, who entered as the NFL's leading rusher, gained four yards on two carries and caught one pass before exiting.

Palmer relieved an ineffective Kyle Boller early in the third quarter and was not much better as he also threw three interceptions. Two were made by Flowers, who returned the first one 58 yards for a score early in the fourth quarter to give Kansas City (3-3) a 28-0 lead.

Acquired from Cincinnati during the week after Jason Campbell went down with a broken collarbone last Sunday, Palmer completed 8 of 21 passes for 116 yards.

Boller went 7 of 14 for 61 yards with three interceptions before being benched. Lewis made the first pick less than 2 1/2 minutes into the game, returning it 59 yards to put the Chiefs ahead 7-0.

Le'Ron McClain scored on a 1-yard run late in the opening quarter and Javier Arenas rushed 7 yards for a TD in the third.

Oakland's best scoring chance came early in the second, when Michael Bush's 35-yard run put the ball on the Chiefs 5. But Bush, who finished with 99 yards on 17 carries, was denied the end zone on four attempts.

Matt Cassel was 15 of 30 for 161 yards with two picks for the Chiefs, who halted the Raiders' eight-game winning streak against AFC West opponents.