ORCHARD PARK, N.Y. (AP) The Buffalo Bills continued adding free-agent depth on defense by signing linebacker Lorenzo Alexander and safety Colt Anderson.

The 32-year-old Alexander has nine years of NFL experience after spending last season in Oakland. He can play outside linebacker and special teams, where he earned a Pro Bowl selection with Washington in 2012.

Overall, he has nine sacks and three forced fumbles in 127 career games.

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The Bills need depth at linebacker after failing to re-sign Nigel Bradham and Ty Powell, and after backup A.J. Tarpley retired last week because of concussion concerns.

Anderson is a sixth-year player, who spent the past two seasons in Indianapolis. Anderson spent his first four years in Philadelphia and also has special teams experience.

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AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL