His Highness the Amir Sheikh Tamim bin Hamad al-Thani and His Highness the Deputy Amir Sheikh Abdullah bin Hamad al-Thani sent Sunday cables of congratulations to German President Frank-Walter Steinmeier on German Unity Day. HE the Prime Minister and Minister of Interior Sheikh Khalid bin Khalifa bin Abdulaziz al-Thani also sent a similar cable of congratulations to German Chancellor Angela Merkel.