Queensdag 2009 in Apeldoorn (celebration of b-day Dutch Queen).
In footage you see open top bus which has Royal family in them...witnessing the accident.
http://www.youtube.com/watch?v=sCtGtluHppA
http://edition.cnn.com/2009/WORLD/europe/04/30/netherlands.queen.car/
Causing now 4 deaths and 5 severly injured others less severe injured. 1 policeofficer injured 1 mp officer injured.
A black page in history
*update* indicated that this incident was done on purpose by attacker !!!