RIYADH — Saudi-led coalition forces on the fourth consecutive day continued to target surface-to-air missiles, anti-aircraft guns, ammunition depots and the movement of the Houthi forces. “There will be no safe haven for Houthis to assemble as coalition fighter planes are in the skies over Yemen around the clock to prevent a Houthi buildup,” Brig. Gen. Ahmad Al-Asiri, adviser at the office of the defense minister, told a news conference here on Sunday. He said the Houthis, who have seized equipment from Yemen's army, were “moving ballistic missiles between civilian homes,” adding that these types of missiles were primary targets for the coalition. He reiterated that the coalition remained “vigilant” in order to safeguard civilian lives and infrastructure. Air forces are targeting all Houthi supply lines, he said. He said it was found that the Houthi militias had moved some planes to a base outside Sanaa, but these bases have been targeted and completely destroyed. Arab coalition airstrikes also targeted Shabwa province in southern Yemen on Sunday, where clashes between the Houthi militias and armed tribes took place. The strikes hit the Beihan area in the Shabwa governorate. Apache helicopters targeted a command center in the south as well as machinery and vehicles which the Houthi militias tried to mobilize toward the southern border region, Asiri told reporters. He said operation at Hodeidah airport was suspended for two hours to help evacuate Pakistanis. They were given a safe passage. As regards the movement of Saudi troops toward the southern border, Asiri said it was a routine procedure. He said carrying out a ground attack has been taken into consideration. Every operation has a specific goal, Asiri said, adding, “In case, a ground attack is required, we have the capabilities, plans and training that guarantee the safety of our ground troops.”