China suggested the US use its influence with Israel to stop the conflict with Iran from spilling over, a sign Beijing is becoming increasingly concerned about the stability of a region it relies on for energy supplies.

Blasts have been heard in Tehran and sirens have sounded in Israel as US president convenes National Security Council.

Israel and Iran have opened a new chapter in their long history of conflict. Israel launched a major attack with strikes early Friday that set off explosions in the Iranian capital of Tehran.