Imprisoned resistance fighters executed by Houthis in Yemen's Taiz
"Rebel militias and forces loyal to former president, Ali Abdullah Saleh executed captives from the Popular Resistance force in Hayfan, Taiz's southern district," military sources confirmed.
"The bodies of Ali Nasser and Ammar Saeed Abdullah were found in the nearby mountains."
An activist from the resistance fighters rank was also killed by Houthis after being tortured while in captivity, according to locals in Humair, western Taiz.
He was shot by a firing squad and dragged, they allege, citing shared images showing his charred body and evidence of boiling water being used to torture him.
Meanwhile, President Abdrabbuh Mansour Hadi and his deputy General Ali Mohsen al-Ahmar arrived along with other officials to the country's Marib province on Sunday, in what is described to be the first official visit by the premier since establishing a temporary capital in Aden in March 2015.
Frequent clashes break out in Marib and surrounding government-held provinces as forces loyal to Hadi attempt to push towards rebel-controlled areas to the north and west of the oil-rich region.
Last week, rockets launched by Houthis killed seven children and wounded dozens of others when they landed in a residential neighbourhood in Marib.
The coalition launched an air campaign in support of Yemen's President Hadi in March 2015 to push back Houthi rebels after they seized the capital Sanaa and many parts of the country.
The war has left some 6,400 people dead, with more than 80 percent of the population in desperate need of humanitarian aid, according to the UN.