China is deeply concerned and worried about the security situation in Thailand, Chinese Foreign Ministry Spokesman Ma Zhaoxu said on Tuesday.

"As a friendly and close neighbor (of Thailand), we hope that all parties act with restraint and make join efforts to restore social stability as soon as possible," Ma told a routine press conference.

Ma said the Chinese government places great importance on protecting the safety and lawful rights of Chinese citizens in Thailand.

He said the Foreign Ministry has already issued a travel warning on its website. The Chinese embassy in Thailand has also set up an emergency telephone hotline for Chinese citizens to seek help.

The embassy has also alerted Chinese groups and citizens in Thailand and asked them to keep a close watch on developments and to be cautious.

Clashes between Thai anti-government protesters and troops have killed at least 35 people and left more than 270 wounded in Bangkok.