The death toll from a cargo ship gas leak in east China's Shandong Province on Saturday has risen to 10, with another 19 people injured, local authorities said in a statement on Sunday.

The injured are in stable condition at a hospital, a local officials said.

The incident happened at around 4:00 p.m. on Saturday at Longyan port in Rongcheng City, Shandong Province, when a Fujian-registered cargo ship had a carbon dioxide leak during maintenance.

A preliminary investigation showed that the leak was caused by a member of the ship's staff. Further investigation is underway.

The authorities said several people are in police custody.