Guardian:

Trump tweeted earlier that Iran “is talking very boldly about targeting certain USA assets” in response to Suleimani’s death. But he said the US had “targeted 52 Iranian sites” and that some were “at a very high level & important to Iran & the Iranian culture, and those targets, and Iran itself, WILL BE HIT VERY FAST AND VERY HARD”.

“The USA wants no more threats!” Trump said, adding that the 52 targets represented the 52 Americans who were held hostage in Iran for 444 days after being seized at the US embassy in Tehran in November 1979.