U.S.-led air strikes have hit at least 177 targets in the Islamic State’s main oil-producing region over the past month, as Washington intensifies efforts to disrupt a key revenue source estimated to provide more than $1 million a day to the militant group. Those strikes include 116 oil tanker trucks hit by coalition forces earlier this week as the United States targeted the vehicles for the first time in the wake of last Friday’s suicide and shooting attacks in Paris claimed by Islamic State. The stepped-up bombing campaign has also targeted oil and gas separation plants, oil rigs, pumps and storage tanks, according to a Reuters tally of air strikes provided by the Pentagon since Oct 22. The campaign marks a more aggressive U.S. approach. Such targets had previously been considered off limits by the U.S.-led coalition as it sought to avoid civilian casualties and limit the damage to […]