LOS ANGELES, SEPT. 23 -- Marcus Allen and Mervyn Fernandez scored touchdowns 2:31 apart in the fourth quarter and Pittsburgh's offense failed to generate a touchdown for the third straight game as the Los Angeles Raiders remained unbeaten with a 20-3 victory today over the Steelers.

The Raiders (3-0) are unbeaten in eight home games at the Los Angeles Coliseum since Art Shell became coach Oct. 3, 1989.

The Steelers (1-2) have scored two touchdowns in three games -- on an interception return and a punt return.

"It was a hard-fought victory; it was like two heavyweights out there slugging it out in the first half," Shell said. "We were trading punches. Then in the second half, we were able to land a few punches and pull it out."

Allen scored on a one-yard run with 11:03 remaining and Fernandez caught a 66-yard touchdown pass from Jay Schroeder with 8:32 left.

"We're starting to come together as a team," Allen said. "You can feel the cohesiveness and the feeling is great."

The only scoring for the punchless Steelers came on a 31-yard field goal by Gary Anderson in the first quarter. Pittsburgh has scored just 26 points in its three games. The Raiders have allowed only 25, fewest in the NFL.

"We are playing pretty well, but we sure hurt ourselves a lot today with mistakes," Pittsburgh quarterback Bubby Brister said. "I did see a few bright spots, though. There is nothing wrong with us that hard work won't cure."