From the AP:

The Federal Communications Commission ordered its staff to destroy all copies of a draft study that suggested greater concentration of media ownership would hurt local TV news coverage, a former lawyer at the agency says.
The report, written in 2004, came to light during the Senate confirmation hearing for FCC Chairman Kevin Martin.
. . .
The analysis showed local ownership of television stations adds almost five and one-half minutes of total news to broadcasts and more than three minutes of “on-location” news. The conclusion is at odds with FCC arguments made when it voted in 2003 to increase the number of television stations a company could own in a single market. It was part of a broader decision liberalizing ownership rules.