(LATIMES) — Nielsen has widened its investigation into a ratings scandal in Los Angeles and uncovered evidence that a Univision Communications radio executive allegedly has been manipulating the ratings.

On Monday, the measurement giant confirmed that the Los Angeles ratings scandal was larger than the company first thought. Last week, Nielsen sought to downplay the incident by saying there was only one problematic household in Nielsen’s audience pool in Los Angeles.

However, acting on a tip from a radio station insider, Nielsen widened its probe. Nielsen determined late last week that there were problems with a second house that participated in the sample audience.

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