Four more players, including running back Robb Riddick of Buffalo and defensive end Greg Townsend of the Los Angeles Raiders, were given 30-day suspensions for drug abuse by the NFL on Friday.

The suspensions bring to seven the number of players, including former All-Pro Dexter Manley of Washington, who have been ordered by the NFL to be placed on their teams' non-football-related injury lists for violating the league's drug and alcohol abuse rules. The seven suspensions is by far the most in any training camp by the NFL.NFL spokesman Joe Browne, however, noted that suspensions normally apply to second offenders and noted: "This is the third year of the testing program, so it's the first time there has been an accumulation of previous tests."

In addition to Riddick, a starter until he was injured last year and Townsend, one of his team's top pass rushers, the others suspended Friday were defensive lineman Richard Reed of Denver and offensive lineman Pat Saindon of Atlanta.

Also on the NFL list were two players whose teams announced their suspensions on Thursday - running back Doug DuBose of San Francisco and offensive lineman Kevin Gogan of Dallas.

Browne said those six won't be allowed to report back to their teams until Sept. 2., two days before the opening games. All must also remain away from their teams' training facilities until then.

Browne didn't specify the substance involved in any of the cases although Dallas newspapers reported Friday that Gogan had been seen smoking marijuana.