"[The Houthis] released on Saturday 69 military, some of them are high-ranking officers of the Republican Guard and intelligence services," the source said.
The conflict between the Houthis and their former allies — units loyal to Saleh — escalated in late November. On December 4, shortly after reaffirming the end of his alliance with the Houthis, Saleh was killed by the rebels.
The situation in Yemen has been extremely unstable since 2015 when a civil war broke out. The war is being waged between the internationally recognized government of President Abd Rabbuh Mansur Hadi and the Houthi movement once backed by army units loyal to Saleh. In March 2015, the Saudi-led coalition of mostly Persian Gulf countries launched airstrikes against the Houthis at Hadi's request.