Israel's Haifa-based Bazan Group said all refinery facilities have been shut down after a power station used to produce steam and electricity were significantly damaged in an attack by Iran, according to a regulatory filing on Monday.

The total number of those killed on Sunday night and the early hours has now reached eight, with 22 civilians having been killed since the start of the conflict.

The Iranian and Israeli strikes mark the most sustained, direct attacks ever between the two rivals. Three people were killed in Israel and at least 78 in Iran, officials said.