The US has approved plans for a series of strikes on Iranian targets in Syria and Iraq. US officials have confirmed this to BBC's US partner CBS News.
Officials said the strikes would take place over a number of days, and weather conditions will likely dictate when they are launched.
It comes after a drone attack killed three US soldiers in Jordan, near the Syria border, on Sunday. The US has blamed an Iranian-backed militia group for the attack.
The Islamic Resistance in Iraq - which is believed to contain multiple militias that have been armed, funded and trained by Iran's Revolutionary Guards force - had said it was responsible for the strike.
Iran has denied any role in the attack which injured 41 other US troops at the military base.