Sanaa , Yemen ( CNN ) Saudi airstrikes over Yemen have resumed once again , two days after Saudi Arabia announced the end of its air campaign . The airstrikes Thursday targeted rebel Houthi militant positions in three parts of Sanaa , two Yemeni Defense Ministry officials said . The attacks lasted four hours . The strikes caused no casualties , but did destroy all three military compounds that were targeted , the officials said . They said Saudi airstrikes were also targeting Houthi positions in Lahj province . On Tuesday , Saudi Arabia announced the end of its Operation Decisive Storm , a nearly month-long air campaign against Houthi positions . The Saudi-led coalition said a new initiative was underway , Operation Renewal of Hope , focused on the political process . But less than 24 hours later , after rebel forces attacked a Yemeni military brigade , the airstrikes resumed , security sources in Taiz said . Five airstrikes targeted a weapons depot in the province late Wednesday , two Taiz security officials said . They said explosions lasted for about 40 minutes . Saudi Arabia and its coalition partners started pounding Houthi positions across Yemen starting on March 26 , hoping to wipe out the Iranian-allied rebel group that overthrew the Yemeni government and seized power . The Saudis say they want to restore the Yemeni government -- a key U.S. ally in the fight against al Qaeda -- which was kicked out of the capital by the rebels earlier this year . This month , Saudi officials said airstrikes have degraded Houthi-controlled military infrastructure , including key buildings in Sanaa . The campaign achieved its objectives `` by a very good planning , very precise execution , by the courage of our pilots , our sailors , our soldiers , '' said Brig . Gen. Ahmed Asiri , a Saudi military spokesman . A senior Saudi official told CNN that the Houthis agreed to `` nearly all demands '' of the U.N. Security Council . A statement from the Saudi Embassy in Washington outlined objectives of the next phase of operations , including protecting civilians , enhancing humanitarian and medical assistance , confronting terrorism and creating an international coalition to provide maritime security . Ground troops will continue to protect the border and confront any attempts to destabilize the situation , Asiri said . Military action will be taken if needed . Houthi leader : 'Anyone who thinks we will surrender is dreaming ' On Wednesday , Houthis released Yemeni Defense Minister Mahmoud al-Subaihi in Sanaa , a senior Saudi source said on the condition of anonymity . The Houthis had said they detained the defense minister at an air base near the Yemeni port city of Aden on March 26 , shortly before the Saudis began their airstrike campaign . The rebels had captured the base that day as part of an advance on the Aden area . The United Nations demanded al-Subaihi 's release earlier this month . But beyond the military campaign , the Saudis and their allies have said they want to find a political solution for the violence-plagued nation . President Abd Rabbuh Mansur Hadi , who says he 's Yemen 's legitimate leader , thanked the Saudi-led coalition . He is working with the Saudis and other allies to return to his country . `` We promise to restructure the Yemen military to ensure that it serves the people of Yemen , '' Hadi said , calling on the Houthis to withdraw , and saying that he would return to Yemen at `` the right time '' to rebuild the country . `` You will witness many changes in the days to come in our mission to build an institutional government and military , far from rebel militancy . '' Why is Saudi Arabia bombing Yemen ? Hakim Almasmari reported from Sanaa ; Holly Yan reported and wrote from Atlanta . CNN 's Mohammed Tawfeeq , Salim Essaid , Nic Robertson and Josh Levs contributed to this report .
After calling off its air campaign , Saudi Arabia resumes airstrikes in Yemen . No casualties are reported , but 3 Yemeni Defense Ministry military compounds were destroyed . Saudi airstrikes resumed after rebel forces attacked a Yemeni military brigade .