Jordan's state-run news agency says border guards opened fire on four vehicles trying to enter illegally from Syria after they ignored orders to stop, without saying whether anyone was killed or wounded in the incident.
The Petra news agency reported the incident Saturday, saying it had taken place the day before.
Officials could not immediately be reached to provide further details.
Jordan hosts nearly 600,000 registered Syrian refugees _ although Jordanian officials say the real number is far higher.
The kingdom has quietly supported Syria's rebels since the start of the uprising in 2011, and ordered Syria's ambassador out last month after accusing him of making ``offensive'' statements about Jordan.