Fuel-burning devices can create carbon monoxide gas because not all of the fuel is burned.

VOA: special.2011.01.25

It was all carefully cut using knives and heated devices.

VOA: special.2011.04.08

And they turned off all the electrical devices they could.

VOA: special.2009.07.22

Boston Police Commissioner Edward Davis. "As soon as there was a nexus to Boston in this investigation, we began to send additional information out to all of our patrol officers - information about IEDS, information about VBEDS, vehicle-borne explosive devices."

VOA: standard.2010.05.14

"How he was able to get on in Nigeria, what happened in Amsterdam, which is a visa waiver country, how he was able to get through and make it this far with the devices he had, these are all issues that have to be resolved."

VOA: standard.2009.12.26