Two people were killed today in a suicide bombing at a mosque in the Saudi city of Najran that was claimed by the Islamic State group, which has repeatedly targeted Shiites in the Sunni-ruled kingdom.
The attack occurred just after Maghrib early evening prayers at the Al-Mashad mosque in the southern city's Dahza neighbourhood, said the Saudi interior ministry.
The IS jihadist group claimed responsibility for the attack on what it said was an Ismaili Shiite mosque, said SITE Intelligence Group, a US monitoring organisation.
Al-Hijaz Province, a group affiliated to IS, said on Twitter that a fighter named Abu Ishaq al-Hijazi detonated his explosive belt at the mosque, causing "many" casualties.
In their statement, the group said the assailant "detonated his explosive belt in an assembly of the rejectionist Ismaili polytheists".
In August, the same group claimed another blast in Saudi Arabia's southern region. Fifteen people died in that suicide bombing at a mosque frequented by members of a police special weapons and tactics unit in Abha city.
"As worshippers were leaving the mosque, a person wearing a suicide belt entered and blew himself up amongst them," the ministry said of the latest attack.
It said one person was killed at the scene and a second died later of injuries. The wounded were taken to hospital, it said without giving a number.
Saudi news channel Al-Ekhbariya earlier said that apart from the initial death, 12 people were wounded. It had also reported that the attacker was wounded.
On its Twitter account, the ministry said investigators found a vehicle belonging to the bomber.
The vehicle contained a letter to his parents about his crime, the ministry added.
Neither the ministry nor the television specified whether the mosque belonged to the kingdom's Sunni majority or the Shiite minority.
But roughly half of Najran's population belongs to the Ismaili community.
Most of Saudi Arabia's Shiites live in Eastern Province, where they have been targeted four times in the past year by bombings and shootings linked to the IS group of Sunni extremists, who consider them heretics.
The latest attack in the east occurred on October 16 when a gunman fired on Shiites commemorating Ashura in the Qatif area, before police shot him dead.
Ashura is one of the holiest occasions for the Shiite faith.
In June, four Shiites died preventing a suicide bomber from entering the hall of Al-Anoud mosque in Dammam city.
Days earlier, 21 people were killed in another Shiite mosque bombing in Eastern Province.
Groups claiming affiliation with IS said they carried out the earlier blasts and the Ashura shooting.
