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    U.S. nuclear secrets are vulnerable to spies, report says

    02:51
  • Top-secret military leaks raise national security concerns

    01:51
  • Pentagon: Airstrikes on Iran-affiliated sites in Syria were ‘proportionate and deliberate’

    02:33
  • TikTok CEO to appear before Congress amid growing security concerns

    04:18
  • Foreign adversaries not responsible for 'Havana syndrome,' say U.S. intel agencies

    03:21
  • China-linked hackers targeted 39 industries on most continents in 2022, report finds

    03:23
  • Biden ordered unidentified aerial objects taken down out of 'abundance of caution'

    04:31
  • U.S. military takes down second 'high-altitude object' over Alaska, origin unknown

    03:43
  • Chinese balloon had antennas capable of collecting signals intelligence

    02:49
  • DHS issues domestic terror threat warning to LGBTQ, Jewish and migrant communities

    04:18
  • House Homeland Security Committee holds hearing on worldwide threats

    03:46
  • Biden's national security adviser Sullivan acknowledges communications with Russia

    01:36
  • CIA honors Harriet Tubman as model spy with statue

    00:53
  • Justice Dept. charges three Iranians with hacking computer networks in global scheme

    01:43
  • Extradition of Julian Assange to the U.S. approved by British government

    02:38
  • Plot by ISIS operative to assassinate former Pres. George W. Bush foiled by law enforcement

    02:01
  • Justice Dept. announces criminal charges against Chinese government over efforts to intimidate

    02:52
  • CIA director: 'Putin has no endgame' in Ukraine as intel shows up to 4,000 Russian soldiers killed 

    03:01
  • White House: Putin 'improvising' Ukraine strategy, was not prepared for U.S. intel

    01:50
  • Russian military exercises in Belarus ‘will continue indefinitely’

    03:00
  • Richard Engel: War 'may be starting right now'

    02:42
  • The lights are blinking red all over Europe

    01:22
  • CIA delivers warning to Russia of consequences over 'Havana Syndrome'

    03:28
  • Former CIA officer says traditional spying is 'dead' due to technology, internet

    04:41
  • Biden announces new defense agreement with U.K., Australia

    03:38
  • How September 11 changed security in America

    01:45
  • Honoring the 13 U.S. service members who lost their lives in the Kabul airport terror attack

    00:23
  • McMaster: Afghanistan 'a one-year war, fought 20 times over'

    01:20
  • Blinken: 'Deeply sorry' to parents of fallen soldiers of Kabul attack

    01:29
  • Blinken: U.S. 'not likely' to have diplomatic presence in Afghanistan after Sept. 1

    00:46
  • MTP Compressed: White House defends chaotic Afghanistan withdrawal

    02:27
  • Cheney: ‘No question that there were mistakes’ in Afghanistan, but U.S. can’t let terrorists hide

    00:53
  • Jake Sullivan: ‘Not going to sugarcoat’ the turbulence in Kabul

    01:31
  • Richard Engel: 'Total panic in Kabul'

    02:32
  • Chuck Todd to Sec. Blinken: How did intel on Afghan security situation ‘end up so wrong?’

    01:35
  • Tom Barrack pleads not guilty, out of prison after posting $250 million bond

    01:55
  • Russia unveils new fighter jet viewed as direct competitor to America's F-35

    04:21
  • U.S. officials say hundreds of Americans reported possible cases of Havana Syndrome

    01:20
  • New ‘Havana syndrome’ cases reported by U.S. officials across globe, including Berlin and Vienna

    02:07
  • Biden administration transfers first detainee out of Guantanamo Bay, 39 prisoners remain

    02:08

Boston bombing suspect drops backpack in video

03:21

The criminal complaint against Dzhokhar Tsarnaev, accused of using a weapon of mass destruction, is built on surveillance video, which shows him dropping a backpack near the finish line and walking away as the bombs go off. NBC’s Anne Thompson reports.