The security in the United States is beefed up today as the nation reaches the twelfth anniversary of the terrorist attacks on September 11, 2001.

Although authorities are unsure of validity of threats that have surfaced in the last day or so, some parts of the country remain particularly on guard. Most notably, Los Angeles International Airport and New York's JFK airport have been the topic of possible threats, according to the ABC News website.

According to the FBI, a man told authorities that al-Qaeda leader Ayman al-Zawahri was in the "final stages" of planning what the Associated Press described as "spectacular" attacks. The unidentified man claimed that he knew of a plan in which three Columbia University students were going to wear explosive devices and blow up JFK. The informant said he would provide more information if the U.S. government compensated him with an undisclosed amount of money. According to the report on ABC News, the FBI decided to spread the word about this threat due to the specific details provided by the informant.

Despite the unknown level of seriousness regarding this threat, the FBI has taken extra precaution to make sure the twelfth anniversary of the attacks occur without incident.

"The FBI and our Joint Terrorism Task Force receive hundreds of threats daily, and we work around the clock with our partners to protect this city and nation," the FBI said in a statement. "We remain on a heightened state of alert, but stress that there is no specific or credible threat at this time."