US Secretary of State Marco Rubio pledged strong support for  Qatar's security on a lightning visit on Tuesday, as anger boils in the Gulf ally over last week's Israeli attack on Hamas negotiators.

On a hastily arranged stop in Doha after a visit to Israel, Rubio shook hands with Qatar's emir, Sheikh Tamim bin Hamad Al Thani, in his office before entering closed door talks that lasted just under an hour. 

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