He said, there have been many cases in the country where the authories were called in to investigate suspicious letter but none proven to have contain any anthrax bacteria.

As such, he urged the people here not to be over-reacting and panicked, responding to a few calls received yesterday following the news of an American Health Co-ordinator received a letter contained powdery substances two days ago in local printed media.

Nevertheless, he advised the members of public to be vigilant if they received any suspecious letter.  He said, they should immediately informed the authorities concerned such as police, fire and rescues department or health department.

Meanwhile, he also urged those involved in the pranks to stop because it had caused the authorities to waste a lot of time and money in investigating, adding that they might arrested under the Internal Security Act if caught.