sniffer

Federal prosecutors said they were taken into custody after a judge ordered searches of their homes in the city by police officers backed by explosive sniffer dogs.

Spanish emergency services said several crews - with drones and sniffer dogs - were deployed to look for those missing after Tuesday's collapse.

One of the boys allegedly walked past the offices of Europol, Eurojust and the Canadian embassy in The Hague carrying a "wi-fi sniffer" - a device designed to identify and intercept wi-fi networks.

But it is this strong smell, as well as the smell associated with their insect poo - frass - that makes them ideal to be found by sniffer dogs.

Out back, it looks almost empty – until a sniffer dog finds stacks of illegal cigarettes and tobacco inside a makeshift wall.