In Thailand', violence is on the rise after three days of rolling street battles in the heart of Bangkok. The Government hinted that a curfew may be imposed on the sprawling metropolis of more than 10 million people. Schools have also been ordered shut tomorrow due to the violence that has killed 25 people since a military operation began Thursday to seal off a 1-square-mile protest camp occupied for weeks by anti-government demonstrators demanding early elections. Speaking on his weekly television programme, Prime Minister Abhisit Vejjajiva insisted that the military operation to quell protests is the answer in ending the country's two-month-long crisis. Army snipers have been perched with high-powered rifles atop tall buildings, viewing the action below through telescopic sights. Thick black smoke billowed from tires set ablaze by demonstrators as gunfire rang out.