China's second aircraft carrier is "taking shape" after two years and nine months of construction, local media reported, a move likely to further unnerve Taiwan and other neighbors about Beijing's growing military assertiveness.

Construction of the Shandong, named after a province in China's east coast, began in 2014, the APP of Shandong television and radio said in a report seen Tuesday.

The Shandong, China's first indigenous aircraft carrier, is "taking shape," the report said. It did not give a date for completion or further details.