Tehran, Sept 29, 2019 (AFP) -

Iran's oil minister on Sunday ordered his country's energy sector to be on high alert to the threat of "physical and cyber" attacks.

Bijan Namdar Zanganeh said "it is necessary for all companies and installations of the oil industry to be on full alert against physical and cyber threats," in a statement published on the oil ministry's Shana website.

Zanganeh said precautions were needed due to American sanctions and the "full-scale economic war" that the Islamic republic accuses the United States of waging against it.

Washington, Riyadh, Berlin, London and Paris blame Iran for attacks that damaged the Saudi oil sector on September 14 and forced the world's largest crude exporter to sharply reduce production.

Tehran denied any link to the strikes, which were claimed by Houthi rebels in Yemen. Iran supports the rebels against a Saudi-led coalition that has been fighting the Houthis since 2015.

Following the attacks, US President Donald Trump said he was preparing a response. Several days later he endorsed military restraint, signalling his preference for intensifying a "maximum pressure" campaign through economic sanctions.

Iran denied press reports on September 21 that its oil installations were disrupted by a cyber attack.