Qatar strips 15,000 Qataris of citizenship :: Aljazeera

Quoting:

Saudi press reports linked the removal of citizenship to the loyalty of members of the Ghufran clan - a branch of the Al-Murra tribe - to Qatar's deposed emir Sheikh Khalifa bin Hamad al-Thani. He was toppled by his son and present ruler, Sheikh Hamad bin Khalifa al-Thani, in a June 1995 palace coup.

However, Gulf Times says:

Qatari authorities have started to settle the issue of about 5,000 people stripped of their citizenship for having defied a ban on dual nationality.Members of the Al-Murra tribe have been most hit by the measure in recent years, claiming as many as 6,000 people who held both Saudi and Qatari citizenship were affected.“About one-third of them have regularised their situation, either by keeping Qatari nationality or by keeping their nationality of origin,” said Khalid al-Attiyah, chairman of the state National Human Rights Committee, which was created by the government in 2003.