Radical Muslims have declared on more than one occasion recently that they intend to try to disrupt their enemy economically if possible. From [1] CNN, :

BAGHDAD, Iraq (CNN) -- Iraq's oil industry appears to be the latest target of insurgents, with an oil company security chief shot to death Wednesday and a second straight day of attacks on a key oil pipeline. ...

Revenues from Iraq's oil industry are in jeopardy in the wake of the latest attacks.

In Kirkuk on Wednesday, gunmen opened fire on a car carrying Ghazi al-Talabani, the security chief for Iraq's Northern Oil Company, killing him and wounding his driver, according to a police source in the northern Iraqi city.

Al-Talabani was a cousin of Jalal Talabani, the leader of the Patriotic Union of Kurdistan and a member of the disbanded Iraqi Governing Council.

Over the weekend, three prominent residents of Kirkuk were killed in targeted attacks, including a well-known Kurdish cleric, a district mayor who also served as a police officer, and the father of Kirkuk's police chief.

Insurgents have been focusing their attacks on participants in the new Iraqi government in advance of the June 30 handover.