A key Libyan pipeline to the port at Es Sider was blown up on Tuesday, Reuters reports.

The explosion could slow production by 70,000 to 100,000 barrels per day (b/d), the National Oil Corporation (NOC) said, according to Bloomberg.

Waha Oil Company, a joint venture between NOC, Hess Corporation, Marathon Oil Corporation, and Conoco, operates the pipeline, Bloomberg reports.

The pipeline was attached by an armed group who placed explosives on the pipeline, according to Reuters. The motivation of the attackers is not clear.

Despite a number of setbacks, Libya’s oil production had risen to close to one million b/d this year, according to Bloomberg.

Waha Oil Company’s production had climbed to 260,000 b/d this year, Reuters previously reported