The Federal Bureau of Investigation arrested two men on Friday on charges of plotting explosions in New York City as a part of an "ongoing terror investigation" trailing the arrest of an Afghan national on similar charges last year.
An accomplice of Al Qaeda associate Najibullah Zazi has pleaded guilty to a plot that involved bombing New York City subways and also admitted to a conspiracy to use weapons of mass destruction.
A 29-year old Pakistani man was on Tuesday sentenced to 40 years in prison by a United States court for plotting terror attacks with Al-Qaeda that targeted a crowded shopping centre in England and the New York City subway system.
Raising fears over the growing threat of home-grown extremism, three Americans, including two women, have been charged in separate cases of plotting terror strikes on United States soil using "weapons of mass destruction" and of travelling to Pakistan to fight against American forces.