According to a Bahraini human rights group, the authorities in Saudi Arabia have detained nine Shia Bahraini Muslims in the country after they had performed Hajj pilgrimage, Arabic-language Lualua television network reported.

Saudi officials have refused to provide any information about the charges brought up against them.

"Saudi security forces had arrested the Shia Bahraini citizens four days ago, while their fate together with charges brought against them are still unknown," Hussain Radhi, with the Bahrain Center for Human Rights, said on Saturday.

Radhi added that Saudi Arabia's officials had briefly detained  the nine Shia Bahraini citizens when they arrived on the Saudi soil, and booked them at police custody and confiscated their passports before letting them leave.

Saudi officials then examined the Shia Bahraini citizens’ case after the completed of their Hajj rituals and decided to arrest them again.

Saudi regime's authorities arrested 229 Indonesians earlier this month, allegedly for trying to join the Hajj pilgrimage rituals without proper permissions.

They had purportedly joined this year’s Hajj rituals without acquiring the necessary documents, and were detained at two Hajj pilgrim shelters around the city of Mecca.

On last year's Hajj pilgrimage, thousands of people lost their lives in the stampede in Saudi Arabia on September 24, 2015.

The tragic incident took place when two roads filled with masses of pilgrims converged during the symbolic ceremony of the stoning of Satan in Jamarat.