Western governments condemned violence in northern Iraq and said on Friday that attacks on foreign troops should not be tolerated, after US and Turkish forces were targeted in two separate incidents on April 14.
"We, the governments of France, Germany, Italy, the United Kingdom, and the United States of America condemn in the strongest terms the April 14 attacks in the Iraqi Kurdistan Region," the statement from Britain's foreign ministry said.
"Attacks on US and Coalition personnel and facilities will not be tolerated and reiterate our steadfast commitment to the fight against ISIS," the statement added.
Wednesday's attack on US forces at Erbil International Airport was the first time an explosives-laden drone was used against a US target in Erbil, an Iraqi security official said.
A Turkish soldier was also killed in a rocket attack on Turkish troops stationed in northern Iraq - a separate attack to Erbil but at around the same time.