Oct. 16 (Bloomberg) -- The FBI is looking into accusations of voter fraud involving a grassroots organization highlighted in last night's presidential debate, the Associated Press said, citing law enforcement officials.

The FBI is examining possible evidence of a coordinated nationwide effort by the Association of Community Organizations for Reform Now, or ACORN, to commit fraud, the AP reported.

In the debate, Republican presidential nominee John McCain said Democratic rival Barack Obama should reveal the full extent of his relationship with ACORN. Obama said he represented the group in a motor-voter case and had no other ties.

ACORN spokesmen said the FBI hasn't contacted the group about an investigation, the AP reported. Some employees have been accused of submitting false voter registration forms with names such as Mickey Mouse and those of Dallas Cowboys football players.

To contact the reporter on this story: Jeff Bliss in Washington jbliss@bloomberg.net.

Last Updated: October 16, 2008 16:59 EDT