For any tourists who do cross the bridge into Mexico, the heavily armed men in blue masks are among the first sights they see.

VOA: standard.2009.04.30

Some of them have surgical masks or other things to cover their noses. We've just come upon the large plaza near many government buildings downtown.

VOA: standard.2010.01.14

Nearby,soldiers guarding a street corner wear surgical masks issued to them by their commanders.

VOA: standard.2009.04.30

On weekend nights, as one artist told us, it's like Carnival without the masks.

VOA: standard.2010.04.15

Some pilgrims wore protective masks to prevent the spread of germs.

VOA: standard.2009.11.29

He and wife buy masks and fans during their travels.

VOA: standard.2010.07.26

Although face masks, which have become a common sight in Mexico City, are worn by only a few people on the streets of Juarez,pharmacies say they are doing a brisk business selling them.

VOA: standard.2009.04.30