Saudi Arabia suffers new losses in its ongoing war on neighboring Yemen, with a spy drone shot down and more troops and mercenaries killed by Houthi fighters.

A military source said Yemeni army soldiers and allied Houthi fighters downed a Saudi drone in Midi Desert in the northwestern Hajjah Province on Sunday.

Yemeni fighters also foiled an attempt by Saudi mercenaries to infiltrate into a military base in Dhale Province, the Arabic-language al-Masirah television network reported.

Separately, Sudan’s army spokesperson Ahmed Khalifa al-Shami said two of the African country’s troops were killed and several others injured in Yemen.

Last month, the Sudanese army said five of its soldiers had been killed and 22 others injured in Yemen.

Sudanese soldiers patrol outside the Yemeni coastal port city of Mukha on April 12, 2017. (Photo by AFP)

On Saturday, Yemeni army snipers shot dead two Saudi soldiers in two separate military bases in the kingdom’s southern Najran region.

Additionally, a unit of the Yemeni military targeted a place of gathering for Saudi mercenaries in Midi Desert.

After more than two years of constant military strikes from the air, sea, and land, and a total embargo on Yemen, Saudi Arabia has been unable to reinstall the former Riyadh-allied Yemeni regime or eliminate the Houthi movement.

Saudi Arabia enjoys backing from its allies such as Sudan in the protracted war which has has already killed over 12,000 Yemenis, according to recent tallies.