Much of Iran's most highly enriched uranium stockpile is stored at Isfahan under IAEA seal, officials have said. The IAEA does not report where it is stored, nor has it said whether it was affected by the strikes.

It follows daytime attacks from both sides, with Israeli strikes in Tehran continuing and Iran firing more missiles towards Israel.

Longstanding tensions came to a head last week when Israel launched a missile attack on Iran, targeting the country's nuclear facilities and killing several high-level military personnel and nuclear scientists. In the days following the two countries have exchanged missile strikes, killing at least 78 in Iran and 13 in Israel.