Seven weeks into the blockade , the besieged PLO acceded to a new agreement for their withdrawal .
Three days later , Israel reentered the PLO - controlled West Beirut and blockaded the city in order to contain insurgency .
Seven weeks into the blockade , the besieged PLO acceded to a new agreement for PLO 's withdrawal .
Three days later , Israel reentered the PLO - controlled West Beirut and blockaded the city in order to contain insurgency .