"It could be hitting natural fractures that already exist." Fox notes that toxic gases like benzene,toluene and hexane also accompany natural gas extraction.

VOA: standard.2010.01.02

Iqbal Khattak, a Peshawar-based journalist for the Daily Times newspaper, says for the army to be successful in South Waziristan, it will also be crucial for it to exploit tribal tensions that exist between the Mehsuds and Wazirs, the two major clans in the region.

VOA: standard.2009.06.18