http://www.icrc.org/eng/assets/files/other/customary-law-rules.pdf

( http://www.humanrightsinvestigations.org)

http://dispatchesfromtheedgeblog.wordpress.com/2011/05/16/war-crimes-and-the-bombing-of-libya/

Now let’s see what the 1977 Protocol Addition to Geneva Conventions of 12 August 1949 say on the business of attacking “infrastructure.”
“In order to ensure respect for and protection of the civilian population and civilian objects, the Parties to the conflict shall at all times distinguish between the civilian population and combatants and between civilian objects and military objectives and accordingly shall direct their operations only against military objectives.”
Article 50 states: “The presence within the civilian population of individuals that do not come within the definition of civilians does not deprive the population of its civilian character.”