Proceeding the British involvement, the sway that the Al Khalifa tribe held over Qatar's affairs began declining. Mohammed bin Thani was described by Gifford Palgrave as the acknowledged governor of the Qatar Peninsula in 1863. Some of Al Wakrah's inhabitants were forced to vacate the town by the Bahraini sheikh in April 1863 due to alleged links with the Wahhabi. The town's chief, Mohammed Bu Kuwara, was taken into custody on a similar charge. In 1866, a report by the British revealed that Qatar was paying an annual zakat of 4,000 German krones to the Wahhabi, in encroachment of the 1861 British treaty. The report also contended that the Al Khalifa were taxing the people of Qatar for the same annual payment.