American expats around the world have been warned to be alert following the announcement that terrorist Osama bin Laden has been killed by US Special Forces.

State Department has put US embassies on alert and a worldwide travel alert was released. The State Department said there was an enhanced potential for anti American violence given recent counter terrorism activity in Pakistan.

'Given the uncertainty and volatility of the current situation, US citizens in areas where recent events could cause anti American violence are strongly urged to limit their travel outside of their homes and hotels and avoid mass gatherings and demonstrations,’ it said in a statement.

‘US citizens should stay current with media coverage of local events and be aware of their surroundings at all times. US citizens abroad are urged to monitor the local news and maintain contact with the nearest US Embassy or Consulate,’ the statement added.

The alert said US embassy operations would continue ‘to the extent possible under the constraints of any evolving security situation’. It added that embassies and consulates may temporarily close or suspend public services, depending on conditions.

‘US government facilities worldwide remain at a heightened state of alert. These facilities may temporarily close or periodically suspend public services to assess their security posture’ it said.

‘In those instances, US Embassies and Consulates will make every effort to provide emergency services to US citizens,’ it continued.

It also said that Americans abroad should stay in touch. ‘Media coverage of local events may cause family and friends to become concerned for their loved ones travelling and residing abroad. We urge US citizens to keep in regular contact with family and friends,’ it said.

It added that US citizens living or travelling abroad are encouraged to enroll in the Department of State’s Smart Traveller Enrollment Programme (STEP), to receive the latest travel updates and information and to obtain updated information on travel and security issues.

‘US citizens without Internet access may register directly with the appropriate US Embassy or Consulate. By enrolling, US citizens make it easier for the US Embassy or Consulate to contact them in case of emergency,’ it continued.