KUALA LUMPUR - Malaysia on Saturday expressed concerns that Australia's plan to build nuclear-powered submarines under a new pact with Britain and the United States could catalyze a nuclear arms race in the Indo-Pacific region.

Australia will build eight nuclear-powered submarines under an Indo-Pacific security partnership that has riled China.

"It will provoke other powers to also act more aggressively in the region, especially in the South China Sea," Malaysia's Prime Minister Office said in a statement.

The statement did not mention China, but Beijing's foreign policy in the region has been increasingly assertive, particularly its maritime claims in the resource-rich South China Sea, some of which conflict with Malaysia's own claims.

"As a country within ASEAN, Malaysia holds the principle of maintaining ASEAN as a Zone of Peace, Freedom and Neutrality (ZOFPAN)," the statement said.

Malaysia urged all parties to avoid any provocation and arms competition in the region.

(Reporting by Mei Mei Chu; Editing by Christina Fincher) ((meifong.chu@thomsonreuters.com; +603-2333-8005; Reuters Messaging: @meixchu on Twitter))