Abduction of Chinese workers in Sudan stirs criticism of Beijing HONG KONG - When China evacuated some 30,000 of its citizens from Libya early last year, official media fell into patriotic rapture. Television screens and newspaper front pages filled with pictures of flag-waving returnees. Xinhua, the state news agency, issued a commemorative DVD. The People's Liberation Army Daily vowed that "no Chinese will ever be left behind." A year later, patriotic pride has turned to anger amid growing frustration over the fate of 29 Chinese nationals abducted by rebels in Sudan on Saturday. The Chinese, employees of a huge state-controlled engineering and construction company, Sinohydro, are being held by the Sudan People's Liberation Movement-North, a ragtag militant outfit. The drama in Sudan's remote, oil-rich South Kordofan region - the latest in a string of attacks on Chinese working overseas - poses a delicate problem for the ruling Communist Party: how to manage the growing nationalism that it has itself done so much to promote. Party propaganda, pride at China's recent achievements and a deep sense of grievance over China's mistreatment at the hands of foreigners in the past have combined to stir demands for robust action. "Nationalism is a double-edged sword," said Zhu Feng, a professor of international relations at Beijing University. Instead of accepting that China's expanding economic presence abroad inevitably increases the risk of trouble, many people react with "exaggerated emotion" and increasingly "think that China must do something muscular" in response to a crisis. "This is the frustration of a rising power," he added. While the official media have mostly played down the hostage drama in Sudan, the Internet is abuzz with anguished cries for action and questioning of why China, despite its rising economic and military power, does not intervene more forcefully to protect citizens who get picked on abroad. "What is the use of a large GDP and foreign exchange reserves if the government is spineless and [we] are still bullied in the same way?" asked a posting on a Chinese equivalent of Twitter. How many Chinese nationals are now working overseas is not known, but the total is thought to number many hundreds of thousands. These range from employees of mammoth state oil and construction corporations, which have led China's push into Sudan, to legions of small-time entrepreneurs and traders. Public scorn As China's economic reach has grown, so has the danger. In Burma last year, rebels attacked a Chinese dam project in the north of the country. A few months later, 13 Chinese sailors were killed on the Mekong River in northern Thailand. Not all attacks end in tragedy: 25 Chinese cement factory workers seized in Egypt were quickly freed this week. Faced with a wave of criticism over the crisis in Sudan, the Foreign Ministry in Beijing on Tuesday summoned Sudan's senior diplomat in Beijing and made an "urgent representation." Deputy foreign minister Xie Hangsheng told him that China "attaches great importance to protecting nationals overseas" and is "deeply shocked" by the abduction in Sudan. The ministry and a government agency responsible for state-owned companies have sent teams to Sudan to try to secure the release of the Chinese, who were working on a road project. Rebels holding them demand that Beijing use its influence to get Sudan to halt attacks by its military and to let aid reach destitute South Kordofan.