The Saudi-led Arab Coalition says it destroyed four locations in Yemen's capital Sanaa that housed drones and launch pads used by Houthi militants.

"Air strikes were conducted in accordance with international humanitarian law, and the coalition took precautions to avoid collateral damage to civilians," a coalition spokesman said in a statement carried Sunday by the official Saudi Press Agency.

The latest operation comes a day after Saudi Arabia said it had intercepted three drones heading towards the kingdom's southern region.

The coalition, which backs Yemen's internationally recognized government, has stepped up operations against the Houthis in recent weeks, conducting air assaults on their military bases in Sanaa and other Yemeni cities under their control.

Earlier this week, the coalition released evidence that Lebanon's Iran-backed Hezbollah movement sent professionals to train the Houthi rebels in the assembly and launch of ballistic missiles and drones from the international airport in Sanaa.

The exhibits featured photographs of Hezbollah members instructing Houthi rebels on putting up explosive-laden drones and satellite imagery of the airport, which the coalition claimed was used to conduct assaults on Saudi Arabia.

According to a recent Washington-based Center for Strategic and International Studies report, Iran's Quds force — the Islamic Revolutionary Guard Corps' overseas operations wing — and Hezbollah have played a "critical role in providing weapons, technology, training, and other assistance to Yemen's Houthis."

"Not only has the number of attacks against Saudi Arabia increased in the last year, but Iran and Hezbollah in Lebanon continue to supply the Houthis with increasingly sophisticated weaponry," the research stated.