Jordan's army said on Sunday its border guards killed five people who were approaching its frontier from Tanf, a Syrian desert town where U.S. special forces training rebels are based.
The town has been a flashpoint in recent weeks as militias backed by Iran have tried to get near the U.S. garrison, prompting U.S. coalition jets to strike back.
Tanf lies near the strategic Damascus-Baghdad highway that was once a major weapons supply route for Iranian weapons into Syria.
The Jordanian army said it destroyed a car and two motorbikes in the incident.