Doha, Qatar: Amir H H Sheikh Tamim bin Hamad Al Thani, Deputy Amir H H Sheikh Abdullah bin Hamad Al Thani, and Prime Minister and Minister of Foreign Affairs H E Sheikh Mohammed bin Abdulrahman bin Jassim Al Thani sent yesterday cables of congratulations to H M Sultan Haitham bin Tariq of the sisterly Sultanate of Oman on the anniversary of assuming the reins of power.