Switzerland. Canton Ticino. Melano. Ticino State Police, Reparto Intervento Speciali. Special Intervention Unit (SIU). Training exercice with SIU men arriving by air and by rigid inflatable boats on a ship following a hostage taking. A policeman aims his APC-556 machine gun on potential ennemies. A police tactical unit (PTU) is a specialised police unit formed and trained to handle situations that are beyond the capabilities of ordinary law enforcement units because of the level of violence - or risk of violence - involved. During the training’s exercice, the police tactical unit intervenes in a high risk situation, such as shootouts, hostage and terrorist incidents.18.02.22 © 2022 Didier Ruef