Dutch nationals who have decided they want to travel to Syria to join Islamic militias should be allowed to go but should be banned from coming back to the Netherlands, Rotterdam mayor Ahmed Aboutaleb says in Wednesday's AD newspaper.

'I want to make sure those who are considering going to Syria know exactly what is at risk,' Aboutaleb said. 'If you think this society is depraved, then go. But there is no way back. Hand over your passport and risk getting bombed.'

Aboutaleb's position directly contradicts the official line taken by the government, which aims to stop people travelling to Syria and Iraq in the first place.

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