Libyan rebels controlling three oil export ports said on Saturday they were ready to negotiate with the government over ending their six-month blockade if Tripoli abandoned plans for a military offensive. Libyan officials on Wednesday gave the armed protesters two weeks to clear the ports they have seized, or face a military strike. Pro-government and rebel forces clashed briefly this week in central Sirte city linking western and eastern Libya. The rebels, who are calling for a greater share in the OPEC nation's oil wealth, managed last week to load oil on to a tanker, which escaped the Libyan navy.