Australia said on Friday it had suspended operations at its embassy in Tehran, citing a deteriorating security situation as Israel hit Iran's nuclear facilities again, and the week-old air war showed no sign yet of an exit strategy from either side.

The open conflict sparked by Israel’s sudden barrage of attacks against Iran’s nuclear and military structure shows no signs of abating.

Israel and Iran have been enemies for decades — but this is their most sustained direct fighting ever. Here’s how a shadow war erupted into an overt conflict.