DUBAI, United Arab Emirates (AP), May 21 (TIWN) — Yemen's Iranian-allied Houthi rebels said Tuesday they attacked a Saudi airport and military base with a bomb-laden drone, an assault acknowledged by the kingdom as Mideast tensions remain high between Tehran and the United States. There were no immediate reports of injuries or damage.

The attack on the Saudi city of Najran came after Iran announced it has quadrupled its uranium-enrichment production capacity, though still a level far lower than needed for atomic weapons, a year after the U.S. withdrew from its nuclear deal with world powers.

Underlining the tensions, Iranian President Hassan Rouhani is seeking expanded executive powers to better deal with "economic war" triggered by the Trump's administration's renewal and escalation of sanctions targeting the Islamic Republic, the state-run IRNA news agency reported Tuesday.

By increasing production, Iran soon will exceed the stockpile limitations set by the nuclear accord. Tehran has set a July 7 deadline for Europe to set new terms for the deal, or it will enrich closer to weapons-grade levels in a Middle East already on edge. The U.S. has deployed bombers and an aircraft carrier to the Persian Gulf over still-unspecified threats from Iran.

In the drone attack, the Houthis' Al-Masirah satellite news channel said early Tuesday they targeted the airport in Najran with a Qasef-2K drone, striking an "arms depot." Najran, 840 kilometers (525 miles) southwest of Riyadh, lies on the Saudi-Yemen border and has repeatedly been targeted by the Iran-allied Houthis.