Police say two improvised explosive devices ignited inside a mall in central Florida.
The Latest on the sentencing of an Ohio man convicted of plotting attacks against the U.S. (all times local): 11:50 a.m.
An Islamic State soldier featured in a propaganda video beheading a Kurdish prisoner is believed to be a New Jersey high school graduate.
Countering China's rapidly expanding military and an increasingly aggressive Russia are now the U.S. military's top national security priorities, outpacing the threat of terrorism, the Pentagon said Friday.
A judge who previously rejected arguments that Saudi Arabia was behind the Sept. 11 attacks has expressed doubts again after claims were revived by congressional action.
A former California college student accused of attempting to provide material support to terrorists in Syria has invoked a rarely used argument in asking a federal judge in Chicago to dismiss the case on grounds he qualifies for immunity commonly bestowed on soldiers.
Secretary of State Rex Tillerson signaled deeper U.S. commitment to Syria on Wednesday, saying America would maintain its military presence there to prevent an Islamic State resurgence.
Lawmakers grilled executives Facebook, Google's YouTube and Twitter on Wednesday about what the companies are doing to prevent terrorists from using their platforms to spread propaganda and recruit new followers.
Federal prosecutors argued Tuesday that a convicted terrorist should spend the rest of his life behind bars because he hasn’t shown “remorse for his crimes” and instead has tried to corrupt other prisoners with his extremist ideology.
Section 702 of the FISA Act should be renewed by Congress this week because it is a vital national security tool.
The brother of a San Diego man believed to be the first American citizen killed while fighting alongside the Islamic State in Syria has been sentenced to 10 years in prison on terrorism-related charges.
President Donald Trump has canceled a trip to London to open the new $1 billion U.S. Embassy in the British capital, avoiding protests promised by political opponents.
U.S. Sen. Dianne Feinstein on Thursday urged President Donald Trump to close the Guantanamo Bay prison in Cuba.
A New York City terror suspect was indicted by a grand jury Wednesday on terrorism and explosives charges connected to an alleged bombing at a transit terminal in December, the U.S. Attorney office announced.
An alleged white supremacist who attended a deadly rally in Charlottesville, Va., last year faces federal charges after trying to wreck an Amtrak train in Nebraska, authorities said.
Guantanamo detainees linked to the 9/11 attacks have accused the prison's guard force of sexual harassment for conducting so-called “groin searches.”
A sweeping new report by congressional Democrats warns of deepening Russian interference throughout Europe and concludes that even as some Western democracies have responded with aggressive counter-measures, President Donald Trump has offered no strategic plan to bolster their efforts or safeguard the U.S. from again falling victim to the Kremlin's systematic meddling.
A white supremacist accused of stopping an Amtrak train in Nebraska has been charged with terrorism.
The United States has announced it is suspending security assistance to Pakistan for failing to take "decisive action" against Taliban militants targeting U.S. personnel in neighboring Afghanistan.
A California man held in connection with a Christmas Day bomb plot allegedly planned to "funnel people into an area in order to shoot them."
Saudi Arabia's lawyers say a judge should reject a New York lawsuit by victims of the Sept. 11 attacks trying to hold the kingdom to blame.
The remains of an American soldier killed fighting in eastern Afghanistan are back home.
The U.S. military says it has carried out an airstrike in Somalia that killed two al-Shabab extremists and destroyed a vehicle carrying explosives, "preventing it from being used against the people in Mogadishu."
Authorities in New York are investigating photographs of an apparent ISIS supporter making selfies outside the Metropolitan Museum of Art and in view of One World Trade Center.
President Donald Trump has returned from an end-of-year holiday to face fresh legislative challenges, midterm elections and threats abroad.
Federal authorities say they have arrested a Virginia man and charged him with attempting to obstruct a terrorism investigation.
Police are promising a bigger security detail than ever before in Times Square for this year's New Year's Eve celebration, which will cap off a year that saw a number of deadly attacks on innocent crowds, including a vehicle rampage at the very spot where revelers will ring in 2018.
The son of a Boston police captain charged with plotting a terrorist attack on a college campus to support the Islamic State group heads to trial next year.
The Department of Homeland Security said chain migration is the common element in two cases allegedly tied to terrorism activities, according to a statement released Saturday.
The FBI said Friday that it found a martyrdom letter and several guns in the home of a former Marine who may have been planning a Christmas Day attack on a popular San Francisco tourist destination.
The Department of Homeland Security is suspending plans to conduct bioterrorism drills near the Kansas-Oklahoma border over concerns about their impact on grounds Native American tribes consider sacred.
The commander leading the campaign against the Islamic State in the Middle East says challenges remain despite pushing the militant organization from some territories throughout the region.
The Latest on the power outage at Atlanta's airport (all times local): ___ 9:35 a.m.
As a physician, I once trained and worked in the emergency room at Bellevue Hospital in New York.
President Donald Trump's new national security strategy seeks to refocus the United States' relationship with the rest of the world, transforming his "America First" mantra into a set of policies and plans for protecting the homeland and advancing its economy.
A jury in suburban Washington has convicted the first police officer charged in the United States with attempting to support the Islamic State.
Come the holidays, millions of periodic worshipers return to church inspired to reconnect with their faith and to regain spiritual grounding.
A man who survived two terror attacks has a message for the assailants: I forgive you.
ISIS threatened to unleash more terror attacks on New York City and depicted NYPD Police Commissioner James O’Neill at the mercy of a knife-wielding jihadi fighter in a frightening new poster released Thursday -- just three days after an ISIS-inspired Bangladeshi man detonated a pipe bomb in a busy subway passageway.
For the second time in two months, someone who has pledged allegiance to the Islamic State has plotted to kill innocents in New York City and has executed his plot.