(KUNA) -- Two British security contractors were killed after an explosive device targeted the US military engineering team they were accompanying between the cities of Karbala and Najaf, said an Iraqi security source on Friday. The source said the attack took place yesterday and that the two British contractors has suffered serious injuries that caused their death, adding that the vehicle's driver also suffered wounds to the legs.He added that the team was on its way to Karbala to work on a school construction project there, adding that team was also responsible for several water and electricity projects around the country.