Switzerland. Canton Ticino. Lugano. Ticino State Police, Reparto Intervento Speciali. Special Intervention Unit (SIU). Training exercice with SIU men arriving by rigid inflatable boats on a ship following a hostage taking. Four policemen ride a rigid-hull inflatable boat while. A policeman aims his APC-556 machine gun on potential ennemies, while others climb with a ladder on the ship. 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. Lake Lugano (Italian: Lago di Lugano or Ceresio) is a glacial lake which is situated on southern Switzerland. 18.02.22 © 2022 Didier Ruef