They also plan to step up cooperation on research into explosives, particularly liquid explosives.

Filled with liquid explosives, they explode when picked up, often children.

In those days, it would have been relatively easy to get liquid explosives past a checkpoint.

"How do liquid explosives work, and what would terrorists do with them on a plane?"

Like nitroglycerin, most liquid explosives are made of unstable molecules.

Various materials are used to convert liquid explosives to a gel form.

Learn how a machine can detect liquid explosives in sealed containers.

It is used by some airport officials in the United States to detect liquid explosives.

On top of liquid explosives as a safety measure.

The portals do not include sensors for liquid explosives, even though terrorists have long shown an interest in them.