Frank R Molver (18 July 2012)
"Syria: Assad regime 'ready to use chemical weapons'"

http://www.bbc.co.uk/news/world-middle-east-18864629
The most senior Syrian politician to defect to the opposition has told the BBC the regime will not hesitate to use chemical weapons if it is cornered.
http://www.debka.com/article/22184/-If-Damascus-falls-Israel-and-its-gas-fields-feared-threatened

The Syrian ruler has stoked up the menace by moving out of storage missiles and shells armed with mustard gas, sarin nerve gas and cyanide stockpiled for years.

They are on operational readiness at Homs, Latakia and Aleppo and, according to Nawaf Fares,

I googles these places mentioned, they are on the border with Turkey, Lebanon and Israel.