The Saudi-led military alliance condemned the attack and said it followed other hostile actions by the group, including an attack on a power distribution unit and a police station near the border, said a statement from coalition spokesman General Turki al-Malki.

BNA, citing a statement from the Bahraini army, said an officer and a soldier were killed.

There was no immediate comment from the Houthi movement.

The incident represented a major escalation after more than a year of relative calm in Yemen as peace efforts gained momentum. It could jeopardise talks between Saudi and Houthi officials who have just held another round of negotiations on a potential agreement towards an end to the conflict in Yemen.

“Such repeated hostile and provocative actions are not consistent with the positive efforts that are being made to seek an end to the crisis and reach a comprehensive political solution,” the coalition’s statement said, adding that it reserves the right to respond at the appropriate time and place.

The Houthis have been fighting against the Saudi-led coalition since 2015 in a conflict that has killed hundreds of thousands of people and left 80% of Yemen’s population dependent on humanitarian aid.

Last week, the Saudi government welcomed what it described as “positive results” from the first direct talks it had with leading Houthi officials over five days in Riyadh.

The US embassy in Bahrain sent a message of condolence to the families of those killed and said it stood by its long-term ally.