"The European Commission condemns in the strongest terms the heinous attack perpetrated against Spanish peacekeeping troops in Lebanon. Our thoughts are with the families and friends of the victims of this attack, and with the Spanish people. Those responsible should be swiftly brought to justice," said the EU Commissioner in a statement.
Six soldiers serving with the UN peacekeeping force in Lebanon (UNIFIL) were killed Sunday after their vehicle was hit by an explosive device.
Three were Colombians in the Spanish army, and three were from Spain. Two other Spanish soldiers were injured in the incident.
The European Commission, the EU's executive body, called on all Lebanon's politicians "to unite in order to face the serious security challenges that Lebanon is currently facing."