In the middle of last week, a woman who claimed her name was Hanan al-Samawi, a 22-year-old engineering student, walked into the U.P.S. office in the upscale Hadda neighborhood of Sana, Yemen’s sprawling capital city.

She displayed a photocopied identification card, and dropped off a bomb hidden inside a printer cartridge with a Chicago address listed as the package’s destination. A few blocks away, another package concealing a homemade bomb was dropped off at a FedEx office, also seemingly headed to Chicago, The New York Times reports.

Within days, the two packages had advanced through four countries in at least four different airplanes — two of them carrying passengers — before they were identified in Britain and Dubai after an 11th-hour tip from Saudi Arabia’s intelligence service set off an international terrorism alert and a frantic hunt.

The foiling of the package plot was a significant success in an era of well-publicized intelligence breakdowns and miscommunications.

It was also a sobering reminder to officials around the world that quick response to timely intelligence rules the day. Despite the billions of dollars governments have spent on elaborate airport technology to guard against terrorism threats, the packages would probably have been loaded onto planes bound for the United States, but for the Saudi tip.

Read the entire story at nytimes.com