Robb posted a comment about this attack on his website today. This is a very traditional insurgent attack, and behold, they're not Islamists, but good ole leftists. I have no idea what the return on investment was from this attack yet, and we probably never will get accurate figures, but it should be a few million dollars worth of bang for the buck. Not only is there lost production, damage to the pipeline that needs repaired, but a huge investment in deploying security forces in an attempt to secure the pipeline(s).

http://www.cnn.com/2007/WORLD/americ...tml#cnnSTCText

Mexico vows to increase pipeline security after blasts
Story Highlights
There were explosions at a natural gas pipeline early Tuesday

A leftist rebel group has claimed responsibility

No oil exports were affected by the blast, officials said
MEXICO CITY, Mexico (Reuters)-- Mexico said on Tuesday it would tighten security at strategic installations after a shadowy leftist rebel group claimed responsibility for a rash of fuel pipeline explosions.

The four blasts shut down pipelines supplying natural gas, liquefied petroleum gas, crude oil and gasoline to the domestic market.

But none of the blasts affected oil exports and no injuries were reported, according to state oil monopoly Pemex.