LONDON — Iran has carried out secret tests of missiles capable of delivering a nuclear payload in breach of UN resolutions, British Foreign Secretary William Hague said Wednesday.

Hague’s comments came a day after Iran’s elite Revolutionary Guards said they had fired 14 missiles in an exercise, one of them a medium-range weapon capable of striking Israel or US targets in the Gulf.

In a statement to lawmakers, Hague said: “Iran has also been carrying out covert ballistic missile tests and rocket launches, including testing missiles capable of delivering a nuclear payload in contravention of UN resolution 1929.”