The United States consulate-general yesterday declined to comment on an incident in which a Greenpeace campaigner was allegedly threatened at gunpoint by security staff hired to protect the US navy ship Blue Ridge. Greenpeace claims a security guard pointed a rifle at one of its campaigners during a peaceful anti-war protest in which they projected the words 'No War' on to the bow of the Blue Ridge from a launch they had hired. The security guard allegedly shouted a warning that the protesters would be shot if they did not move away. Members of the green group yesterday paraded in front of the US consulate and delivered an open letter to consul-general James Keith, demanding an explanation and an apology over the incident. 'The level of force that the security staff used was not only completely disproportionate to the threat but also highly irresponsible,' said Alice Yeung, Action Campaigner of Greenpeace. A spokeswoman for the US consulate said: 'The consulate is not making any comment.' Police said no charges had been laid and no arrests had been made. Police officers are still investigating whether there was any case of a real threat, and whether a criminal offence had been committed.