On Oct. 3, authorities arrested Headley as he was about to fly from Chicago to Pakistan and said they found videos and maps of the newspaper in his luggage. Headley reportedly had plans to fly from Copenhagen to the U.S. on Oct. 29.
In December, Headley pleaded not guilty to all charges.
Accused of Plotting to Attack New York on the 8th Anniversary of 9/11
If Zazi's alleged plan had been carried out, it would have been the worst attack on the U.S. since 9/11, said U.S. Attorney General Eric Holder.
The Afghan born and Queens raised 24-year-old is accused of plotting to bomb New York on the eighth anniversary of the 9/11 attacks. A former coffee vendor from New York, Zazi moved to Colorado and allegedly bought materials similar to those used in the 2005 London train bombings, which killed more than 50 people. Zazi went to beauty supply stores to purchase large quantities of acetone and hydrogen peroxide, prosecutors said.
In September, a federal grand jury indicted Zazi on charges of conspiracy to use weapons of mass destruction.
Prosecutors say Zazi attended a bomb-making class at an Al Qaeda training camp in Pakistan, and had bomb-making instructions on his laptop.
Zazi has pleaded not guilty and is being held without bail.
Bryant Neal Vinas
Allegedly Assisted al-Qaeda in Plot to Attack New York's Penn Station
In January 2009, Vinas pleaded guilty to firing rockets at U.S. troops in Afghanistan and helping Al Qaeda plot attacks on a Long Island Railroad train at Penn Station.
The 26-year-old U.S. Army veteran, raised on New York's Long Island, grew up Catholic but converted to Islam three or four years ago. Prosecutors say he was radicalized over the Internet. In Sep. 2007, he left his father's New York home and later travelled to Pakistan to meet with members of Al Qaeda. Vinas offered the terrorist group information about the railroad, went through their training camp, and assisted in a rocket attack against American troops.
Pakistani authorities captured Vinas in Peshawar in Nov. 2008 and turned him over to the U.S. government. Vinas remains in the custody of the U.S. Marshals as he awaits sentencing. He could receive a life sentence.
Maj. Nidal Hasan
Charged in the Fort Hood Massacre
The Army major is charged with killing 13 people and attempting to kill 32 others in a Nov. 6 shooting spree at the Fort Hood Army base in Texas.
Hasan, a 39-year-old Army psychiatrist born and raised in Virginia, reportedly sought guidance about jihad from radical Muslim cleric and al Qaeda recruiter Anwar Awlaki.
In an interview published on Al Jazeera's Web site, Awlaki says that Hasan, who initiated an e-mail correspondence with him in late 2008, asked about killing American military personnel in his very first message. The two exchanged as many as 18 e-mails in the year prior to the shooting.
Hasan is being prosecuted in the military justice system and could be sentenced to death if convicted. His civilian attorney, John Galligan, has said Hasan will probably plead not guilty. Galligan has also said he is considering an insanity defense.