Such devices are found increasingly in public places like airports, restaurants and office buildings.

VOA: special.2009.08.11

They can make houses, office buildings,stores or factories.

VOA: special.2010.07.30

Then they set fire to the draft office and several buildings nearby.

VOA: special.2009.10.29

Legs were broken and one person was severely injured during stampede as panicked shoppers and office workers surged out of buildings.

VOA: standard.2009.09.07