Foreign embassies in Bangkok have warned their citizens to exercise caution amid mounting security fears ahead of a court decision over whether to dissolve Thailand's two largest political parties, Thai Rak Thai and the Democrat Party. Australia, Canada, France and Japan have all advised their citizens to show a high degree of personal security awareness as a verdict Wednesday could trigger violent demonstrations in the Thai capital. Some 900 police will be deployed on Bangkok's streets on Wednesday, protecting the Constitutional Tribunal offices and setting up checkpoints to deter party supporters from traveling to the capital from the provinces. Meanwhile, some 15,000 Thai troops are now on alert across the country to deter possible violence.