Saudi authorities on Saturday identified Saudi national Salih bin Abdulrahman Salih Al Ghishaami as the suicide bomber whose attack on a mosque in the eastern part of the kingdom killed 21 and wounded 81 people, Al Arabiya News reported.

Saudi authorities arrested 26 members of a cell affiliated with Daesh militant group, who claimed responsibility for Friday's attack, Saudi Ministry of Interior spokesman Maj. Gen. Mansour al Turki said.

"His name was Salih bin Abdulrahman Salih Al Ghishaami, a Saudi national. He was wanted by security services for belonging to a terrorist cell receiving directions from Daesh [ISIS] abroad," the the official Saudi Press Agency quoted an interior ministry statement as saying.

Al-Qishaami's father had been "detained for a while," Turki added.

Separately, it was revealed that five members of the same cell were responsible for the death of a Saudi soldier two weeks ago, a statement from the ministry said.

The Saudi interior ministry vowed on Friday to arrest the masterminds behind the "cowardly" attack, adding that the hunt for those responsible is still going.