Ammar Abdulmajid-Mohamed Said, 19, was arrested for allegedly plotting to carry out an ISIS-inspired mass attack on a military facility near Detroit, according to newly unsealed court records.

Ammar Abdulmajid-Mohamed Said allegedly engaged in detailed attack planning to carry out a mass shooting at the U.S. Army's Tank-Automotive & Armaments Command facility.

The FBI says the former Army guardsman thought he was conducting the attack with two ISIS radicals, but they were actually undercover FBI agents.

Ammar Abdulmajid-Mohamed Said, 19, was taken into custody on Tuesday.

The remains of 30 people believed to have been killed by the militant Islamic State group have been found in a remote Syrian town in a search led by Qatari search teams along with the FBI

The ISIS chief, Abdallah Makki Muslih al-Rifai, also known as "Abu Khadijah," was killed in the strike along with another operative from the group, officials said.

A Tajik national living in Brooklyn was arrested Wednesday on charges he conspired to support the Islamic State and its offshoot in Central Asia, ISIS-K.

A Tajik national living in Brooklyn was arrested Wednesday on charges he conspired to support the Islamic State and its offshoot in Central Asia, ISIS-K.

Officials say a Syrian man, 23, is charged with murder and attempted murder for stabbing and killing a 14-year-old and wounding five others in Villach, Austria.

The United States used fighter jets to conduct an airstrike against Islamic State targets in Somalia on Saturday, according to U.S. officials.

The strikes were coordinated with the Somalia government. 

U.S. officials announced they conducted an airstrike on Syrian soil that killed two ISIS members, including a top official.

Anas Said is being detained on no bond because the FBI believes he is an ISIS radical who poses a clear and present danger.

Prosecutors claim the 28-year-old attempted to buy a gun, researched how to make an explosive belt and scouted potential target sites for a mass casualty terrorist attack on U.S. soil. 

Two American service members are recovering from wounds suffered in the raid in Iraq that targeted top ISIS leaders and killed multiple ISIS operatives.

Two U.S. service members were injured overnight in a raid in Iraq that targeted top ISIS leaders and killed "multiple" ISIS operatives, the Pentagon said Tuesday.

Two U.S. service members were injured overnight in a raid in Iraq that targeted top ISIS leaders and killed "multiple" ISIS operatives, the Pentagon said Tuesday.

A United States Army soldier has been sentenced to 14 years in prison after he allegedly attempted to assist ISIS in conducting a deadly ambush on U.S. troops.

The FBI alleges an Afghan national named Nasir Ahmad Tawhedi was in the final stages of preparation for an attack, in which he expected to die, targeting election day.

The Justice Department announced the arrest Tuesday of an Afghan national accused of plotting to kill Americans on Election Day on behalf of the terror group ISIS.

Four 4 ISIS leaders were killed last month in the raid that left seven U.S. service members injured.

A 20-year-old man was arrested in Canada for an ISIS-inspired plot to "slaughter" Jewish people.

Seven U.S. personnel injured in Iraq raid that killed 15 ISIS members, officials said.

Seven U.S. troops were injured during an early morning raid in western Iraq.

ISIS claimed responsibility for the stabbing that killed three at a festival in Germany. American police are concerned about similar attacks in the U.S., inspired by terror killings in Europe.

A 25-year-old Syrian national is accused of three counts of murder and eight counts of attempted murder in a stabbing spree.

A suspect is in custody in relation to the deadly knife attack at a German festival, police said. The Islamic State group claimed responsibility, calling it a response to deaths in Gaza and elsewhere.

Two people have been detained in connection to the violent stabbing attack in the city of Solingen, Germany at least 3 victims dead and many injured.

Man who plotted attack on Swift concert was loyal to them, ABC News reported.

A U.S. airstrike in Somalia targeted the top ISIS leader in that country, it remains unclear if he was killed in the strike, according to officials.

Several U.S. officials tell ABC News’ that Abdul Qadir Mumin was the target of the strike, but it has not been confirmed yet if he was killed.

The suspects crossed into the U.S. via the southern border, a source told ABC News.

ICE arrested eight Tajikistan nationals who entered into the U.S. illegally through the southern border last year.

The source said they had been tracked since crossing the U.S. southern border.

Eight suspects from Tajikistan with suspected ties to ISIS were detained in Los Angeles, Philadelphia and New York City after crossing the Southern Border into the U.S. last year and this year.

After the terror group’s attacks overseas, authorities here in the U.S. are now on alert ahead of a major sports tournament. ABC News' Rhiannon Ally reports.

Alexander Mercurio, 18, was arrested for attempting to provide material support to ISIS, police said. The FBI thwarted his plans to use knives, firearms and fire for attacks, authorities said.

The Justice Department announced the arrest of a man they say planned to carry out attacks on churches over the weekend after pledging support to the terror group ISIS.

ISIS has claimed responsibility for the attack in Moscow that killed at least 144.

ABC News’ Martha Raddatz interviews former CENTCOM Commander Gen. Frank McKenzie on “This Week.”

ABC News’ Martha Raddatz reports on the resurgence of the militants on “This Week.”

ISIS has a "strong desire" to attack the U.S. and other foreign powers -- a threat that is only growing -- retired Gen. Frank McKenzie warned on Sunday

ABC News’ Martha Raddatz breaks down the latest in the Moscow concert hall attack on “This Week.”

A Colorado teenager has been charged with providing material support to ISIS.

Hundreds of Yazidi-Americans filed a civil lawsuit Friday against French conglomerate Lafarge S.A. for conspiring to provide material support to the Islamic State.

A British man accused of being one of the four ISIS "Beatles" who beat and killed U.S. hostages in Syria was faced down in federal court by two of their victims' mothers.

El Shafee Elsheikh faces a life sentence following his conviction by a federal jury.

U.S. officials say the drones that killed terrorist leader Usamah al-Muhajir near Aleppo, Syria were harassed by Russian aircraft on the same day.

The U.S. military said Saturday that U.S. drones "harassed" by Russian jets on Friday later carried out airstrike on a top ISIS leader

The Supreme Court on Thursday sided with social media giants in a case brought by families of victims in a terrorist attack in Turkey.