At least 31 Yemenis have died and 25 others sustained injuries in Saudi Arabia's latest acts of military aggression against the impoverished nation.

The warplanes pummeled southwestern Yemen on Friday, killing eight civilians and injuring four others in Al Bayda Province.

Airstrikes against the city of Ibb took the lives of nine people, mostly women and children, and wounded 18 more, while two civilians died after the fighters targeted the Taiz Province.

Pounding northwestern Yemen, Saudi aerial attacks claimed the lives of three grocery store workers in the city of Dhahyan, killed five and injured two others in the Razeh district, and wounded a child elsewhere in the Sa’ada Province.

The bombardment of the Al Hawak district in the Al Hudaydah Province, located in the west, also claimed the lives of three people.

Yemeni retaliation

Returning Saudi strikes, the Yemeni army and popular committees fired rockets at two military bases in the Zahran and Najran regions in the kingdom’s southwest.

Army forces also neutralized Saudi efforts to retake an outpost in the southwestern Jizan region and destroyed two Saudi tanks.

Saudi Arabia began its military aggression against Yemen on March 26 – without a UN mandate – to restore power to fugitive former Yemeni President Abd Rabbuh Mansur Hadi, a staunch ally of Riyadh, and to undermine the Houthi Ansarullah movement.

Smoke billows into the sky following airstrikes in the Yemeni capital, Sana'a, on August 20, 2015 (AFP photo).

Over 4,300 people have been killed in the Yemen conflict since late March, according to the World Health Organization. Local Yemeni sources, however, say the fatality figure is much higher.

Brigadier General Ahmed Assiri, a Saudi military spokesperson, said on Wednesday that the country’s ground troops had entered Yemen’s northern territories to counter the growing retaliatory attacks by Yemeni forces on Saudi soil.

He said Saudi forces had pushed their way into the northern Yemeni regions, which overlook Jizan.