Interesting Addition to the Office of Naval Intelligence's Worldwide Threats to Shipping Report: China

From the U.S. Navy's Office of Naval Intelligence's Worldwide Threats to Shipping Report of 30 July 2015 (pdf):

SOUTH CHINA SEA: On 21 July, two Vietnam-flagged fishing boats re
ported being chased and rammed by a Chinese ship in an area approximately 15 nm west of the western section of the Spratly Islands.

and

4.(U) SOUTH CHINA SEA: On 21 July, two Vietnam-flagged fishing boats reported being chased and rammed by a Chinese ship in an area approximately 15 nm west of the western section of the Spratly Islands. Both fishing boat captains reported that navigation lightsand other parts of their boats were damaged as a result of the repeated ramming. Reportedly, the Chinese ship had the number 994 on the hull. (www.vietnambreakingnews.com)

Spratly Islands are in the oval in the nearby map.

China's PLA Navy ship with hull number 994 is a 072A class landing ship.

Hmmm.