By Francois Murphy

VIENNA, Jan 16 (Reuters) - Regional fears of a U.S. attack on Iran have eased after President Donald Trump said Tehran had assured him that protesters would not be executed, but he is keeping "all of his options on the table", the White House said.

The last major strikes on Iran were carried out by Israel and the United States in June, mainly targeting key nuclear facilities.

WHICH NUCLEAR SITES WERE HIT?

All three of Iran's uranium-enrichment plants - two at Natanz and one buried inside a mountain at Fordow - as well as a sprawling complex at Isfahan, which includes facilities that are part of the nuclear fuel cycle and an underground area where diplomats say much of Iran's enriched uranium has been stored.

HOW BAD WAS THE DAMAGE DONE?

The U.N. nuclear watchdog, which carried out regular inspections at nuclear facilities including Natanz and Fordow until they were attacked, has not been granted access to those facilities since they were bombed.

It has inspected other facilities that were not damaged but the exact status of the ones that were remains unclear.

In a quarterly report on Iran in November,........

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