Iran has launched missiles at Diego Garcia, an Indian Ocean island that is home to a strategic U.K.-U.S. military base.

Iran launched two ballistic missiles at Britain’s Diego Garcia base in the Indian Ocean in a dramatic escalation of tensions, US officials have said.

The Khorramshahr-4, a 20-tonne rocket that can carry 80 cluster munitions, is thought to have been the weapon fired at the joint UK-US base in the Chagos Islands.