By Sara Toth Stub

Tel Aviv--Israel's antitrust authority is to consider whether Noble Energy Ltd. and its local partner have a monopoly in the natural gas sector and need to reduce holdings, a spokesman for the authority said, effectively ending an agreement made three years ago that Noble and Delek Group Ltd. were allowed to retain stakes in the country's two largest gas fields in exchange for selling holdings in two smaller fields.

A Noble official in Israel was highly critical of the antitrust authority's decision to investigate whether there is a monopoly, saying in a statement that Noble would reconsider its investment in Israel.

"The antitrust authority's questioning of Noble's entry into these licenses was without legal basis, and remains groundless," Binyamin Zomer, Noble's country manager for Israel said Tuesday.

Noble owns 39.66% of the Leviathan field and 36% of the Tamar field. Israeli company Delek Group, through its subsidiaries, controls about 40% of Leviathan and 30% of Tamar.

Tamar, containing about 9 trillion cubic feet, began production last year, and the larger Leviathan field has yet to be developed. Several preliminary deals have been signed to export Israeli gas to neighboring Jordan and Egypt, although no deals have been finalized.

Noble, the only large foreign energy company working in Israel, has invested about $6 billion in the last 16 years to develop Israeli offshore gas fields.

Write to Sara Toth Stub at realtimedesklondon@dowjones.com

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