Yemen's president Ali Abdullah Saleh is in Riyadh for medical treatment, after he was injured in an attack on his compound on Friday, the Saudi royal court said in a statement.
"The Yemeni president has arrived along with officials and citizens who had received different injuries for treatment in Saudi Arabia," the royal court said on Sunday.
Saleh will be treated for wounds received on Friday in a rocket attack on his presidential palace - an assault that marked a major escalation in a conflict building towards full civil war.
Pro-democracy protesters in Yemen celebrated on Sunday following news of the president's departure.
Al Jazeera has learned that Saleh arrived at King Khalid Air Base in Riyadh and was transferred to a military hospital.
The embattled leader suffered "burns and scratches to the face and chest," an official said, after the ruling General People's Congress said he was "lightly wounded in the back of the head".
Meanwhile, sources told Al Jazeera that vice-president Abd-Rabbu Mansour Hadi had taken over as acting president and supreme commander of the armed forces.
The White House later confirmed to Al Jazeera that an aide in the administration of US president Barack Obama had spoken to Hadi - though details of their conversation were not known.
The extent of Saleh's injuries has been a matter of intense speculation. When the rocket struck the mosque in his presidential compound and splintered the pulpit, he was surrounded by senior government officials and bodyguards.
Eleven guards died, and five officials standing nearby were seriously wounded and taken to Saudi Arabia.
The president delivered an audio address afterwards, his voice labored, with only an old photo shown.
'Outlaw gang'
In his address, delivered on state television late on Friday, Saleh said the attack was carried out by an "outlaw gang", referring to the Hashed tribal federation led by Sadiq al-Ahmar, a powerful dissident tribesman.
Al-Ahmar's fighters have been battling government forces in the capital since a truce crumbled on Tuesday.
Witnesses said sporadic shelling and rocket fire on Saturday rattled the al-Hasaba district of northern Sanaa where al-Ahmar has his base, forcing residents to flee. The area is suffering from water and electricity cuts.
But al-Ahmar's office denied responsibility and instead blamed Saleh for the attack, calling it part of his effort to help justify a government escalation of street fighting in the capital.
Ten people were killed and 35 others injured in southern Sanaa on Friday as Yemeni troops shelled the home of Hamid al-Ahmar, the brother of Sadiq al-Ahmar, Hamid's office said on Saturday.
Hamid, a prominent businessman, is a leader of Yemen's biggest opposition party, Al-Islah (reform).
The shelling in Hada neighborhood also targeted the homes of Sadiq's two other brothers, Hemyar and Mizhij, and that of Ali Mohsen al-Ahmar, a dissident army general.
On Saturday, sources said the powerful Yemeni tribal federation battling Saleh's security forces and forces loyal to him agreed to abide to a Saudi-brokered one-week truce.
PHOTO CAPTION
Yemeni President Ali Abdullah Saleh
Al-Jazeera