On 9 June 2004, a nail bomb detonated in Cologne, Germany, in a business area popular with immigrants from Turkey. Twenty-two people were wounded, with four sustaining serious injuries. A barber shop was destroyed; many shops and numerous parked cars were seriously damaged by the explosion and by the nails added to the bomb for extra damage. Authorities initially excluded the possibility of a terrorist attack. The bomb, which contained more than 800 nails, was hidden in a travel compartment on a bicycle left in front of the barber shop.