A number of powerful explosions have been heard in Saudi Arabia’s port city of Yanbu', local sources said Monday, with reports falling short of giving any reason for the blasts or possible casualties.

No further details have been made available up to this moment and no group or individual has assumed responsibility for the blasts.

Yanbu' is an important petroleum shipping terminal for Saudi Arabia and home to three oil refineries, a plastics facility and several other petrochemical plants.

The second largest Saudi city along the Red Sea coast, Yanbu is also the second port, after Jeddah, and serves as the main port for the holy city of Medina.

Some social media activists claim the port city has been struck by rockets.