Meanwhile, President Donald Trump says "every military target" on Iran's key oil island has been "totally obliterated", but no damage to oil infrastructure has been reported
Kharg Island is a tiny but strategic terminal in the northern Gulf, 22 miles off the coast of Iran - here's a look at why it is so significant
In response, Tehran warns oil and energy infrastructure belonging to firms that co-operate with the US will be "turned into a pile of ashes" if Iran's energy facilities are attacked
Elsewhere in the Middle East: Tehran residents tell the BBC the capital was "hit hard" overnight as Israel and Iran both warn of fresh attacks; at least 12 medical staff have been killed in an Israeli strike in Lebanon
Shoham, central Israel, where an overnight missile strike hit a residential area, taking the roof off a building.The Israel Defense Forces (IDF) said it detected Iranian missiles targeting Israel overnight.
Home Front Command members and emergency services can be seen inspecting the damage at the scene.
Shortly after midnight in Doha, people living in the central Musheireb district got phone alerts to evacuate immediately to the "nearest safe place" as a "precautionary measure".
Some residents and hotel guests rushed into underground car parks for shelter.
Then around 01:30 (22:30 GMT) a thunderous boom echoed across the city. A member of the BBC's team here saw the explosion as the missile was intercepted, briefly lighting up the city skyline. That was followed by distant bangs in the opposite direction.
Later this morning, the Qataris shot down a second missile.
If you look at the areas receiving evacuation orders, it seems the aim was to protect places which host US economic interests. Iran said earlier this week these were legitimate targets.
Offices for Google and American Express are located in Musheireb, as are some Qatari government offices.
Parts of a 12-acre campus known as Education City were also evacuated, possibly because Microsoft has a presence there, as do branches of six American universities.