At least four Saudi forces have been killed and 20 others wounded in border clashes with armed Yemeni tribesmen in southern Saudi Arabia, Yemeni media say.

The skirmishes happened in the Dhahran region on Saturday morning, with the number of casualties expected to increase, Yemen-based Arabic-language Watten news agency reported.

Last week, tens of Saudi soldiers were killed and a number of others captured after members of the Takhya tribe launched a retaliatory attack on the al-Minare military base in Saudi Arabia near the northern Yemeni border city of Sa�ada.

In another incident on Saturday, Saudi artillery heavily shelled the al-Azd mountainous region in Yemen�s Sa�ada Province, Arabic-language�al-Masirah�satellite television network reported.

Saudi jets also attacked the al-Mas military base in the northern part of Ma�rib Province in Yemen�s east on the same day, latest reports say.

The developments come as Saudi warplanes are currently bombing the presidential palace in the southern city of�Taiz and the al-Mazraq�camp in the northern Hajjah Province.

Saudi jets reportedly also targeted 22 Mayo Stadium�in Yemen�s southern port city of Aden and a scientific center�in Sana�a�s Arhab district.

Saudi Arabia�s military aggression against Yemen started on March 26, without a UN mandate, in a bid to restore power to the former�fugitive president, Abd Rabbuh Mansur Hadi, a close ally of Riyadh.

Earlier this week, Colonel Sharaf Luqman, the spokesman for Yemen�s armed forces and popular committees, said civilians and Yemeni infrastructure have been the target of the Saudi aggression.

According to Luqman, around 2,600 people have been killed during the Saudi aggression.

The United Nations has called for an immediate �humanitarian pause� of at least a few hours each day to allow deliveries of urgently needed aid to the conflict-weary country.

By Press TV