US and Iranian fighter pilots have had another close encounter. The Pentagon says an Iranian jet began following an unmanned surveillance drone in international airspace earlier this week, reports the Wall Street Journal. It didn't break off pursuit until two US jets approached within two miles of the Iranian craft and warned it away. CNN says the incident took place over Oman. Last November, Iran jets fired at a US drone and missed, and in 2011, Iran captured a US spy drone that crashed.