The terror group circulated a statement on Twitter, saying a suicide bomber had infiltrated a "military camp" for the Special Emergency Force in southwestern Asir province, Reuters reported. But it didn’t specify the attack was in a mosque.

The attacker struck the mosque during the early afternoon in the city of Abha, the provincial capital, which is southeast of Mecca and not far from the Yemeni border.

The Saudi interior ministry said the attack killed 15 people. However, earlier state television El-Ikhbariya put the death toll at 17. Saudi Arabia’s emergency forces used the mosque, the Al Arabiya television channel has claimed.