Terrorism Close Calls

A suspicious online purchase helps start the FBI's investigation into a chemical engineering student's quest to inflict horrendous damage on America.

A number of international intelligence agencies work together to thwart a terrorist scheme to blow up American cargo planes in flight.

A car salesman plans to assassinate the Saudi Ambassador to the U.S. with some help from a Mexican cartel member -- who happens to be a DEA source.

Suicide bombers plan to use explosive liquids disguised in sports drinks to blow up at least seven separate planes bound for North America.

A man with ties to white supremacists goes on the run after his plan to bomb a Martin Luther King Day march is foiled by the FBI.

Four terrorists plan a two-pronged attack in Germany: detonate bombs in popular nightclubs, followed by larger bombs in the streets once people flee.

A young mother's suicide attack at an Israeli checkpoint ignites interest in her motivations as well as her baffling backstory.

The arrest of a 14-year-old boy in England sparks a frantic investigation into a terror plot halfway around the world in Australia.

A horrific terrorist plot -- suicide bombers and shooters working in tandem -- is foiled when a suspect makes an unexpected move.