Washington - Supporters of US Democrat candidate Bernie Sanders filed hundreds of complaints to federal authorities on alleged irregularities by television stations in the coverage of the election campaign, The Hill reported on Sunday.

A 890-page document illustrates a summary of the 850 complaints submitted to the Federal Communications Commission (FCC) against Fox News, CNN and MSNBC for alleged bias towards some presidential candidates.

The text, which was obtained by The Hill after invoking the Freedom of Information Act, refers to objections to the activity of the three cable news networks throughout the process prior to the November elections.

The main popular complaints are directed against CNN's coverage some days after the first debate among democratic candidates in October 2015.

In what was to be a coordinated effort, more than 160 proposals argue about the alleged lack of objectivity of that news station in favor of candidate Hillary Clinton, saying that the news station failed to show the results of surveys showing the victory of Sanders in that meeting.

They also ensure that the broadcast was edited with obvious damage for the Vermont senator.

About a dozen complaints say that the television networks give much coverage, mostly too favorable, to Republican candidate Donald Trump.

Other 50 statements reveal to the FCC that most debates by the candidates were limited only to cable networks that sometimes are not available to the general population at home, in addition to 27 percent of US homes with no access to the Internet.

The Hill notes that although some complaints are a little disoriented, the flow of claims stresses the scope of what is called the "digital army" that is behind Sanders. It became a decisive force on Twitter, Facebook and other social networks.