EMBED >More News Videos FBI raids drug treatment clinic in Camden: Sarah Bloomquist reports during Action News at Noon on April 18, 2018.

CAMDEN, N.J. (WPVI) -- Federal authorities raided a drug treatment facility in Camden.FBI agents converged on the methadone clinic on North 5th Street before 8:30 a.m. Wednesday.The exact nature of the investigation was unclear.North 5th Street was closed between Market and Federal Streets for most of the day on Wednesday due to a heavy police presence.Methadone is a drug used by some treatment centers to help reduce the withdrawal symptoms from heroin.------