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Brian Todd examines clues in the video of David Haines' execution. Do British authorities know who the executioner is?
Luring teenagers, smuggling or kidnapping fighters, Brian Todd looks at ISIS' methods to recruit westerners.
Brian Todd reports on criticism of President Obama's characterization of counter-terror campaign in Yemen as "successful."
Brian Todd takes a look at the information on the "Laptop of Doom" and what it exposes about ISIS' plans for attacks.
CNN's Brian Todd looks at why the U.S. military hasn't specifically targeted ISIS leaders during airstrikes.
Brian Todd reports on a new video from ISIS showing what appears to be combat footage and heavy weaponry.
Do ISIS' slickly-produced videos emulate Hollywood movies? CNN's Brian Todd looked into the terror group's techniques and followed up his report by answering your questions on Twitter.
Here are some highlights from his Twitter Q&A:
CNN's Brian Todd profiles Darren Wilson, the police officer who fatally shot unarmed teen Michael Brown in Ferguson.
CNN's Brian Todd reports on the criticism of the "militarization" of American police, illustrated in Ferguson, Missouri.
Brian Todd takes a look at how ISIS could threaten the United States and give the country reason to intervene in Iraq.