Five global public relations firms have made pitches to the Chinese government for a potential new campaign, four sources said, as Beijing tries to communicate more effectively with the West.

The competition by the leading Western PR companies comes amid intensifying scrutiny of Chinese companies abroad, a crackdown on dissent at home and rising tensions in the South China Sea.

The State Council Information Office (SCIO), the government's information and propaganda arm, has heard presentations from Hill+Knowlton, Ketchum, and Ogilvy Public Relations, according to four people and company communications seen by Reuters.