BEIRUT, May 15 (Reuters) - Arab League mediators brokered a deal on Thursday to end Lebanon's worst round of internal fighting since the civil war, Lebanese political sources said.

They said the head of an Arab League delegation, Qatari Prime Minister Sheikh Hamad bin Jassim bin Jabr al-Thani, will announce the deal at a news conference in Beirut shortly.

(Writing by Nadim Ladki)

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