Tokyo Gas, Japan's biggest city gas supplier, and British energy supplier Centrica have signed a binding agreement in 2019 to jointly purchase 2.6 million tonnes of LNG a year from the Mozambique project from the start-up of production until the early 2040s.

Earlier this week, Total declared force majeure on its $20 billion LNG project in Mozambique and confirmed it had withdrawn all staff from the construction site following insurgent attacks last month.

"To be honest, we are worried about the project," Tokyo Gas CFO Hirofumi Sato told an earnings news conference.

"But we have not been officially notified any delays in the project," he said, declining to comment on any impact on its long-term procurement from the force majeure.

Total, which aimed to produce its first cargo from the project in 2024, suspended work on March 27 after the militant attack.

(Reporting by Yuka Obayashi; editing by David Evans)