Jordan’s military said on Tuesday that six people were killed and 14 wounded in a car bomb attack on Jordanian troops along the kingdom’s border with Syria.

“Six soldiers have been martyred and 14 others were wounded in the terrorist attack,” a military official said, adding that it was a “preliminary toll.”

The attack took place at 5:30 am in the Rukban district near a makeshift camp for tens of thousands of Syrian refugees who are stranded in the desert, awaiting entry to Jordan, the army earlier said in a brief statement.

No militant group has claimed responsibility for the attack.

Foreign Minister Nasser Judeh condemned the “cowardly attack.”

“Terrorists strike again this time against our border guard,” he tweeted on his official account. “This evil will be defeated.”

On June 6, a gunman killed five Jordanian intelligence officers in a Palestinian refugee camp north of the capital.

A suspect was later arrested but details of the attack have been kept under a gag order while the investigation continues.

Tens of thousands of Syrian refugees have sought shelter at two remote desert camps in the northeast — one at Rukban and another at Handalat further west.