JERUSALEM/DUBAI/WASHINGTON, June 13 (Reuters) - Israel said early on Friday it had struck Iranian nuclear targets to block Tehran from developing atomic weapons, and Iranian media and witnesses reported explosions including at the country’s main uranium enrichment facility.

Calling the offensive “Rising Lion,” Israel said it was also targeting Iranian commanders and missile factories, and declared a state of emergency in anticipation of retaliatory missile and drone strikes by Tehran.

“We are at a decisive moment in Israel’s history,” Israeli Prime Minister Benjamin Netanyahu said in a recorded video message.

Israel targeted Iranian scientists working on a nuclear bomb, its ballistic missile programme and its Nantanz uranium enrichment facility, in an operation that would continue for days, he said.

A witness in Nantanz city said multiple explosions were heard near the facility, and a senior Iranian official told Reuters that the country’s leadership was holding a top security meeting.