The Police Tactical Unit (PTU) is a paramilitary specialist unit of the Singapore Police Force and comes under the direct command of the Special Operations Command. Based in Queenstown, it is the main anti-rioting and disaster-management unit of the police force. They are also called upon to handle cases of serious crime in progress, particularly cases involving firearms. From 2004, PTU officers also presented greater public prominence when they conducted patrols in public areas, such as at Orchard Road, Holland Village and Serangoon Gardens Estate, partly as a response to greater terrorism concerns.