Sri Lanka, April 6 -- European Council President António Costa warned Monday that the targeting of energy facilities would be "illegal and unacceptable" after US President Donald Trump threatened to hit Iranian power plants if the Strait of Hormuz is not reopened.

Without directly referencing Trump's comments, Costa said the "targeting of civilian infrastructure, namely energy facilities, is illegal and unacceptable."

The White House has said the US military would always act in accordance with the law, but legal experts have told CNN that attacks on civilian infrastructure such as power facilities would likely constitute a war crime.

"The Iranian civilian population is the main victim of the Iranian regime. It would also be the ma...