BEIJING: Beijing recently conducted "high-intensity" naval exercises in the South China Sea, China's defence ministry said Thursday, as tensions grow over the Asian power's manoeuvres in the contested waters.

China's expanding military presence in the region has worried several of its neighbours, while the US has vowed to stand up against Beijing's territorial claims to much of the South China Sea, including the contested Paracel Islands.

Chinese H-6G and H-6J jet bombers carried out "high-intensity training, and completed day-and-night training exercises in taking off and landing, long-range assault, and attacks on sea targets," defence ministry spokesman Ren Guoqiang said at a virtual press conference Thursday.

Ren said the exercises were part of routine training and had "achieved the expected results", without giving their specific location.

China - which is locked in disputes with neighbours including India, Japan and Vietnam over islands in the South China Sea - has infuriated other nations by building artificial islands with military installations in parts of the sea.