Ellen Nakashima The Washington Post

A US ambassador's cellphone call to President Donald Trump from a restaurant in the capital of Ukraine last summer was a stunning breach of security, exposing the conversation to surveillance by foreign intelligence services, including Russia's, former U.S. officials said.

Two former Twitter employees and a third man were charged in San Francisco Federal Court Wednesday with spying on Twitter users critical of the Saudi royal family, the US Justice Department announced. Case highlights the issue of foreign powers exploiting American social media platforms. Charges also reflect the wealth of data that firms compile.

The Justice Department has charged two former Twitter employees with spying for Saudi Arabia by accessing the company's information on dissidents who use the platform, marking the first time federal prosecutors have publicly accused the kingdom of running agents in the United States.

Several days after President Donald Trump's phone call with the leader of Ukraine, a top White House lawyer instructed a senior national security official not to discuss his grave concerns about the leaders' conversation with anyone outside the White House, according to three people familiar with the aide's testimony.

US commandos zeroed in on Abu Bakr al-Baghdadi's final hideout with the help of an extraordinarily well-placed informant, an ISIS operative who facilitated the terrorist leader's movements around Syria and even helped oversee construction work on his Syrian safe house, according to US and Middle East-based officials knowledgeable about the operatio...

Two British men accused of involvement in the ISIS's summary executions of Western hostages, including Americans, are being transferred into US military custody because the Turkish incursion into Syria threatened their continued detention by Kurdish forces in northeastern Syria, according to US officials.

The United States, Britain and Australia are calling on Facebook to halt its plans to deploy strong encryption across all its messaging apps unless it can provide a way for investigators to see communications in the clear.

President Donald Trump told two senior Russian officials in a 2017 Oval Office meeting that he was unconcerned about Moscow's interference in the U.S. election because the United States did the same in other countries

In 2017, the United States extracted from Russia an important CIA source who had provided information about the Kremlin's interference in the 2016 presidential election, according to current and former officials.

Huawei secretly helped the North Korean government build and maintain the country's commercial wireless network, according to internal documents obtained by The Washington Post.

President Donald Trump approved an offensive cyber strike that disabled Iranian computer systems used to control rocket and missile launches

The forces of the ISIS may no longer control a swath of territory across Iraq and Syria, but the coordinated attacks in Sri Lanka demonstrated that the resilient group can still sow carnage beyond the borders of its former caliphate.

NSA discovered what has been called the largest breach of classified data in its history after a tip from a banned Russian firm.

The Justice Department has acknowledged errors and deficiencies in a controversial report issued a year ago that implied a link between terrorism in the United States and immigration, but - for the second and final time - officials have declined to retract or correct the document.

The US and four of its closest allies blamed China on Thursday for a 12-year campaign of cyber-attacks that vacuumed up technology and trade secrets in 12 countries.

A US ambassador's cellphone call to President Donald Trump from a restaurant in the capital of Ukraine last summer was a stunning breach of security, exposing the conversation to surveillance by foreign intelligence services, including Russia's, former U.S. officials said.

Two former Twitter employees and a third man were charged in San Francisco Federal Court Wednesday with spying on Twitter users critical of the Saudi royal family, the US Justice Department announced. Case highlights the issue of foreign powers exploiting American social media platforms. Charges also reflect the wealth of data that firms compile.

The Justice Department has charged two former Twitter employees with spying for Saudi Arabia by accessing the company's information on dissidents who use the platform, marking the first time federal prosecutors have publicly accused the kingdom of running agents in the United States.

Several days after President Donald Trump's phone call with the leader of Ukraine, a top White House lawyer instructed a senior national security official not to discuss his grave concerns about the leaders' conversation with anyone outside the White House, according to three people familiar with the aide's testimony.

US commandos zeroed in on Abu Bakr al-Baghdadi's final hideout with the help of an extraordinarily well-placed informant, an ISIS operative who facilitated the terrorist leader's movements around Syria and even helped oversee construction work on his Syrian safe house, according to US and Middle East-based officials knowledgeable about the operatio...

Two British men accused of involvement in the ISIS's summary executions of Western hostages, including Americans, are being transferred into US military custody because the Turkish incursion into Syria threatened their continued detention by Kurdish forces in northeastern Syria, according to US officials.

The United States, Britain and Australia are calling on Facebook to halt its plans to deploy strong encryption across all its messaging apps unless it can provide a way for investigators to see communications in the clear.

President Donald Trump told two senior Russian officials in a 2017 Oval Office meeting that he was unconcerned about Moscow's interference in the U.S. election because the United States did the same in other countries

In 2017, the United States extracted from Russia an important CIA source who had provided information about the Kremlin's interference in the 2016 presidential election, according to current and former officials.

Huawei secretly helped the North Korean government build and maintain the country's commercial wireless network, according to internal documents obtained by The Washington Post.

President Donald Trump approved an offensive cyber strike that disabled Iranian computer systems used to control rocket and missile launches

The forces of the ISIS may no longer control a swath of territory across Iraq and Syria, but the coordinated attacks in Sri Lanka demonstrated that the resilient group can still sow carnage beyond the borders of its former caliphate.

NSA discovered what has been called the largest breach of classified data in its history after a tip from a banned Russian firm.

The Justice Department has acknowledged errors and deficiencies in a controversial report issued a year ago that implied a link between terrorism in the United States and immigration, but - for the second and final time - officials have declined to retract or correct the document.

The US and four of its closest allies blamed China on Thursday for a 12-year campaign of cyber-attacks that vacuumed up technology and trade secrets in 12 countries.