Police drones simulation with blue emergency lights flying in the sky over New York City downtown and watching down with a camera. Drones used for law enforcement can easily move in the air and broadcast video for surveillance, crime control and prevent terrorist acts in urban environments. The quadricopter has a camera, antennas for communication and GPS to follow the route to destination. City background is a slightly defocused view of Manhattan. Composite image with 3D simulation of two white drones. Day with sunlight.