A police operation has been launched in Hamburg after suspicious fumes were detected

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Two "youths" have fled the scene after spraying the toxic substance in a carriage carrying around 50 people.

Several people, including two children aged three and six, were hurt and treated by first responders.

The children suffered respiratory and eye problems - although their injuries are not thought to be serious.

One photo showed a paramedic consoling an upset children with a balloon fashioned from a first aid glove.