Attempts to censor details of controversial influenza experiments that created a highly infectious form of bird-flu virus are unlikely to stop the information from leaking out, according to scientists familiar with the research. The US Government has asked the editors of two scientific journals to refrain from publishing key parts of research on the H5N1 strain of bird-flu in order to prevent the information falling into the hands of terrorists intent on recreating the same flu strain for use as a bioweapon. However, scientists yesterday condemned the move. Some said that the decision comes too late because the information has already been shared widely among flu researchers, while others argued that the move could obstruct attempts to find new vaccines and drugs against an infectious form of human H5N1 if it appeared naturally. Professor Richard Ebright, a molecular biologist at Rutgers University in Piscataway, New Jersey, said that the research, which was funded by the US Government, should never have been done without first assessing the risks and benefits. The work posed risks that outweighed benefits and that were clearly foreseeable before the work was performed, Professor Ebright said. The work should have been reviewed at the national or international level before being performed, and should have been restricted at a national or international level before being performed, he said.