A total of 2,148 people have been evacuated to the kingdom from Sudan so far, including more than 2,000 foreigners, the Saudi foreign ministry says.
Witnesses report air strikes and paramilitary forces fire anti-aircraft weapons while WHO warns of "huge biological risk" after fighters occupy laboratory in capital Khartoum.
Fighting continues despite a 24-hour ceasefire lobbied for by countries trying to evacuate their citizens as conflict leaves nearly 300 people dead and thousands wounded.
Saudi Foreign Minister Faisal had said in February that a consensus was building in the Arab world that a new approach to Syria requiring negotiations with Damascus would be needed to address humanitarian crises.
Haniyeh’s visit coincides with an official visit by Palestinian President Mahmoud Abbas, who arrived in the kingdom on Monday.
The crown prince said an election would be held "in the period to come".
The two Middle East powerhouses had held several rounds of dialogue in Iraq and Oman before reaching the agreement to mend ties on March 10 in China.
The visit will be the first by Hamas to Saudi Arabia in years.
Clashes between powerful paramilitary and regular army leave at least 27 people dead and 170 wounded, doctors' group says, sparking global calls for calm in the African country which has seen decades of unrest.
Violent clashes that erupted in Sudan, leaving at least three civilians dead, raise international concern amid fears of the conflict escalating further.
Recent diplomatic rapprochement between Riyadh and Tehran has paved the way for the swap of nearly 900 detainees held by rival forces in war-torn Yemen.
Arab diplomats meeting in Saudi city of Jeddah agree to find a solution for Syria's civil war, emphasising "importance of having an Arab leadership role in efforts" to end it.
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