Libyan oil authorities in coordination with foreign oil companies are investigating the cause of blast that occurred on Tuesday night near Zueitina, an oil port in the east of the country. Acting Director of National Oil Corporation Mr. Abulqasim Shanqeer announced Wednesday that a blast occurred in the pipeline linking Field 103 with Zueitina export terminal.He said oil companies operating near the blast established a crisis joint committee to deal with the situation.The pipeline carries crude produced by the Abu Attifel oil field, operated by the Mellitah Oil Company, a joint venture between the NOC and Italy's Eni , and by the Nakhlah oil field, operated by Germany's Wintershall.The Ejdabiya Attorney was also informed of the incident which would be viewed as caused by sabotage."Initial reports show the initial explosion was on the condensate pipeline. That then had an impact on the crude pipeline, and due to the pressure it must have burst," Musbah Al-Warfalli, a Zueitina security official and a member of the crisis committee, said as quoted by Reuters.Repair efforts started immediately on Wednesday morning.Libyan oil officials have been talking of upgrading the old oil pipelines which always need maintenance. Libyan oil output increased to 1.55 million barrels bpd and is expected to reach 1.7 by June according to Deputy Oil Minister Omar Shakmak.