The Security Council condemned on Friday the use of chemical weapons in the Persian Gulf war, expressing deep dismay over their "more intense and frequent" use against Iran.

The 15 council members voted unanimously to condemn the use of chemical weapons in the Iran-Iraq war as a violation of a 1925 Geneva protocol banning use of such weapons in warfare.The British-sponsored resolution did not name Iraq as the attacker, but cited reports by U.N. chemical weapons experts blaming the Baghdad government for using poison gas, including a mustard gas attack on an Iranian city Aug. 2.

At that time, both Iran and Iraq had accepted Security Council Resolution 598 demanding a cease-fire in the 8-year-old war, but no truce date had been set.

Peace talks opened Thursday in Geneva between Iran and Iraq. A Kurdish guerrilla group, the Kurdish Democratic Party, claims Iraq dropped poison gas bombs on six Kurdish villages in northern Iraq that day.

Kurds have been fighting Iraq, Iran and Turkey for more than 50 years to gain a separate homeland.

Iraq admitted last month that it had used chemical weapons, but claimed Iran used them first. Iran says it has the ability to produce such weapons, but has not done so.

The resolution asked other nations to halt the export of chemicals used to produce such weapons, and encouraged Secretary-General Javier Perez de Cuellar to promptly investigate allegations of the use of chemical weapons.

It noted the continuing negotiations of the Conference on Disarmament in Geneva on banning the development, production and stockpiling of chemical weapons and arranging the destruction of current stockpiles.

The 1925 Geneva protocol bans the use of chemical and biological weapons but does not prohibit their manufacture.

The Security Council passed a similar resolution in May, but that one did not specifically cite the use of chemical weapons against Iranians.

On Tuesday, the Security Council released a report by U.N. investigators that blamed Iraq for using mustard gas Aug. 2 in an air raid on Oshnaviyah, an Iranian city near the northeast corner of Iraq. U.N. experts found chemical and medical evidence of mustard gas use and also shell splinters similar to those found after attacks on Iranian civilians in 1984, 1986, 1987 and earlier this year.