The head of the political bureau of Gaza-based group Hamas has vowed revenge after Israeli police killed three Palestinian men in the occupied West Bank city of Nablus earlier this week. Ismail Haniyeh on Wednesday offered his condolences to the families of the three men who were killed in an Israeli police operation and said the “blood of the martyrs” will not be shed without consequences. He condemned Israel for conducting assassinations and said that their operations will not deter Palestinians from carrying out “acts of resistance”. He added that the killings should be a trigger for the Pa…