Saudi Arabia and the United Nations on Tuesday condemned an attack on its territory that killed two Bahraini military personnel near the border with war-torn Yemen.
Bahrain has participated in a Saudi-led coalition mobilised in 2015 to topple the Huthi rebels and restore the internationally backed government of Yemen, which the Huthis drove out of the capital Sanaa in 2014.
The ensuing war has left hundreds of thousands dead through direct and indirect causes and displaced millions in what the UN has called one of the world's worst humanitarian crises.
Bahrain's military said late Monday that one officer and one enlisted soldier had been killed in what it described as a drone attack perpetrated by the Huthis.
The Saudi foreign ministry voiced its "condemnation and denunciation" of a "treacherous attack on the defence force of the sister Kingdom of Bahrain stationed on the southern border of the kingdom, which resulted in the martyrdom of a number of its brave soldiers and the injury of others," the official Saudi Press Agency reported.
Hans Grundberg, the UN's special envoy to Yemen, also condemned the attack and said "continued flare-ups of fighting demonstrate the fragility of the situation in Yemen," which has been at war for nearly a decade.
"Any renewal of offensive military escalation risks plunging Yemen back into a cycle of violence and undermines ongoing peace efforts," he said.
"We have been in touch with all sides to urge them to exercise maximum restraint at this critical time, and to use dialogue to resolve differences and diffuse military tensions."
The Saudi statement did not explicitly blame the Iran-backed Huthis for the attack, but it renewed the kingdom's call for a halt to weapons exports to them.
- 'Provocative actions' -
The Organisation of Islamic Cooperation, based in Jeddah, did attribute the incident to a "Huthi drone attack" in a statement on Tuesday, and said: "Such provocative actions are not consistent with the positive efforts made to end the crisis in Yemen."
The Huthis have not commented on the attack.
On Monday, the Huthis' Al-Masirah TV channel reported separately that "four citizens" were wounded in Saudi attacks on Yemeni territory near the border on Monday.
The attack that killed the Bahraini soldiers came as Saudi Arabia pushes for a lasting ceasefire nearly a year and a half after agreeing to a truce with the Huthis that has largely held despite officially expiring last October.
Hopes for peace were boosted in March when Saudi Arabia struck a surprise rapprochement deal with Iran, which has backed the Huthis.
The following month, Mohammed al-Jaber, the Saudi ambassador to Yemen, travelled to Sanaa to meet with Huthi officials in what he described as a bid to "stabilise" last year's truce.
Last week, Huthi officials completed five days of talks in Riyadh, the first public visit by a Huthi delegation to Saudi Arabia since hostilities broke out.