Qatari Emir Sheikh Hamad bin Khalifa al-Thani (R) walks alongside Gaza's Hamas prime minister Ismail Haniya (L) during a welcome ceremony at the Rafah border crossing with Egypt in the Gaza Strip. Qatar's emir called for Palestinian unity as he made a landmark visit to the Gaza Strip on Tuesday, the first to the enclave by a head of state since Hamas took over in 2007
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