President Abd Rabbuh Mansour Hadi ordered further military support to the offensive to retake Yemen's province of Taiz, officials in the southern port city of Aden said on Sunday.
He tasked the military and popular resistance chiefs, who led the battles to retake southern regions months ago, to join the offensive and deploy more troops and equipment in support of the forces in Taiz, the officials added.
The offensive to drive the Houthi militants out of Taiz was launched two weeks ago.
On Sunday, battles continued to rage on key war fronts in downtown and on the outskirts, sources within the popular resistance said.
The pro-government and resistance forces launched a battle to liberate the western parts after they retook key positions in downtown, they said.
Moreover, the sources revealed that military reinforcements from the south arrived at the Wadi Al-Dhabab front and have already joined the battles against the Houthis, they added.
Battles between the pro-government forces and the Houthi militants continued in the provinces of Dhali, Baidha and Ibb, local sources said.
In Dhali, around 13 Houthis were killed after the forces repelled an attack to retake positions in the district of Morais, locals said.
The battles coincided with fresh airstrikes by the Saudi-led coalition in the capital Sanaa, the hugest in weeks targeting Houthi camps and weapons depots in western and eastern parts.
The coalition has been bombing the militants since March.
Lately, international organizations including Human Rights Watch accused the coalition if committing war crimes in Yemen.
In addition, organizations have criticized Saudi Arabia's failure to launch investigations into alleged war crimes.
A few months ago, the UN dropped a proposal by the Netherlands for an international, independent probe into alleged war crimes in the country.
Instead, it asked Saudi Arabia and the government of Yemen to be responsible for the probe.
According to the UN, around 6.000 civilians have been killed in the 8-months conflict most of whom were killed by airstrikes.