The FBI has used secret evidence obtained under the Foreign Intelligence Surveillance Act to prosecute at least 27 accused terrorists since 2007, according to a Reuters review of public records.
President Barack Obama is defending top secret US spying programs and called them transparent even though they are authorized in secret.
Rogue US intelligence tech Edward Snowden issued a defiant rebuke to his critics in Washington on Monday and warned more leaks were on the way, declaring: "Truth is coming and it cannot be stopped."
US President Barack Obama sparred with Russia's Vladimir Putin over how to end the war in Syria on Monday during an icy encounter at a G8 summit where divisions over the conflict eclipsed the rest of the agenda.
US President Barack Obama said that China has understood his "very blunt" message that cyber-hacking against the United States will lead to a deterioration of relations between the two powers.
Top US intelligence officials have said that information gleaned from two controversial data-collection programs run by the National Security Agency thwarted potential terrorist plots in the US and more than 20 other countries and that gathered data is destroyed every five years.
A 6.5-magnitude earthquake jolted several towns along Nicaragua's Pacific coast today, rattling buildings but causing only minor damage.
US secretary of state John Kerry warned for the first time on Saturday that chances for a political settlement in Syria could be undermined by the Assad regime's use of chemical weapons.
News of a massive surveillance effort led by the secretive National Security Agency has sent Web users scrambling to find new ways to avoid tracking.
Top US intelligence officials said Saturday that information gleaned from two controversial data-collection programs run by the National Security Agency thwarted potential terrorist plots in the US and more than 20 other countries - and that gathered data is destroyed every five years.
A second victim of an explosion at a Louisiana chemical plant died on Friday, while federal authorities opened an investigation to determine the cause of the deadly blast.
The US House of Representative passed an amendment linking the American military aid with the human rights in Pakistan, in particular those of religious and ethnic minorities.
A Congressional resolution recognising the 100th anniversary of the founding of the Ghadar Party in the US has been introduced in the House of Representatives.
Shells hit a United Nations base in Sudan's troubled South Kordofan state today, killing one peacekeeper and wounding two more, a UN spokesman said.
Syrian President Bashar al-Assad has crossed a "red line" by using chemical weapons in the strife-torn country, prompting the US to send military support to rebels for the first time, a top American official said.