DENVER (AP) -Champ Bailey's interception just before halftime helped the Denver Broncos to a 13-3 lead over the Oakland Raiders after three quarters on Sunday night.

Oakland capitalized on a Broncos' special teams turnover with a 47-yard field goal by Sebastian Janikowski in the third quarter, the only scoring of the period.

The Raiders forced a fumble on punt coverage when Chris Carr stripped the football from Darrent Williams along the sideline after a 21-yard return by Williams. Robert Thomas fell on the football and the Raiders had the ball on the 48.

Oakland moved to the 16 and then Denver's defense held its ground. Back-to-back sacks by Demetrin Veal and Patrick Chukwurah forced the Raiders to settle for Janikowski's field goal with 7:11 left.

The Broncos' defense has given up only one touchdown all season.

Denver punted on its only offensive possession of the third quarter.

Jason Elam kicked field goals in the second quarter from 51 and 22 yards as the Broncos led 13-0 at halftime.

The Raiders had the ball on the Denver 26 with 1:17 left when Bailey jumped a corner route and picked off a pass intended for Randy Moss. It was Bailey's second straight week with an interception right before halftime.

Moss had a 51-yard reception on third-and-1 to put the Raiders in position to score.

Javon Walker gained 29 yards on a double reverse to set up Jason Elam's 22-yard field goal with 3:59 remaining. Walker took a handoff from Rod Smith and went around left end for the big gain down to the Raiders 24.

Denver had the ball first-and-goal at the 9 but couldn't score a TD. Cecil Sapp dropped a pass on third down.

Elam kicked a 51-yard field goal with 10:09 remaining in the second quarter, capping an eight-play drive that began at the Denver 38. The drive was aided by an unnecessary roughness call on Oakland's Stanford Routt, who was starting in place of cornerback Fabian Washington.

It was Elam's first kick over 50 yards this season and 36th of his career in the regular season.

Walker hauled in a 54-yard pass from Jake Plummer to set up Tatum Bell's 2-yard touchdown run in the first quarter. Bell's touchdown with 39 seconds left in the first quarter was the first time all season the Broncos scored in the opening quarter.

Walker beat Nnamdi Asomugha on the long pass.

Janikowski's 54-yard field goal attempt was wide right for Oakland in the first quarter.

Bell came into Sunday game leading the AFC in yards rushing per game (96.8). He had 61 yards rushing through three quarters.

Denver's defense lived up to its stingy reputation Sunday, giving up just 113 yards of offense in the first half. The Broncos and the 2000 Miami Dolphins are the only two teams since 1940 to give up only one touchdown through the first four games.

Art Shell's return to the sideline this season hasn't been smooth. Oakland came into the game with the worst offense in the NFL, averaging 225.3 yards, and the Raiders recently suspended receiver Jerry Porter without pay for conduct detrimental to the team.

Porter was inactive for the first four games of the season after feuding with Shell and demanding a trade at the beginning of training camp. Porter was the Raiders' leading receiver last season with 942 yards.

The Raiders were one of four teams to enter Week 6 without a win. Detroit, Tennessee and Tampa Bay all won Sunday afternoon.

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