Iran has slammed the leaders of the G7 for their support of Israel as "biased and irresponsible", amid deepening fears of an escalating regional conflict.
Iran bombed Israel on Tuesday night with 180 ballistic missiles after the IDF moved ground troops into Lebanon to fight Hezbollah militants, an Iranian client group.
No one was killed in the Iranian bombing barrage, but Israel has vowed that there will be "consequences".
Western countries such as the US and the UK have backed Israel's right to defend itself, but insisted that it must show "restraint".
Iran has said any response from Israel to the bombing will result in a second round of airstrikes.
The G7 – comprised of the US, UK, France, Germany, Japan, Canada and Italy – condemned the Iranian strikes on Wednesday and said they would "work jointly to promote a reduction in regional tensions".
The UK and allies continued to urge Israel and its adversaries to pull back from the brink of all-out war in the Middle East.
Israel is still considering how to retaliate to Iran's ballistic missile barrage earlier this week.
Meanwhile Israel and Hezbollah continue to fight in Lebanon. The IDF said it killed 15 Hezbollah militants on Thursday, after eight of its own soldiers were killed on Wednesday.
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Israel has warned people living in Lebanon near the border with Israel to evacuate – including people living in the city of Nabatieh, which has a population of between 60,000 and 100,000.
Meanwhile foreign nationals are being urged to get out of the country, and the UK continues to fly its citizens back home after the first chartered flight arrived on Wednesday.
More than 150 British nationals and dependents left Beirut on the first UK Government-chartered plane.
The Foreign Office said a "limited number" of additional flights had been chartered, including one on Thursday.
Lebanon's Middle East Airlines is also continuing to operate its scheduled services from Beirut.
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Foreign Secretary David Lammy said: "Recent events have demonstrated the volatility of the situation in Lebanon.
"The safety of British nationals in Lebanon continues to be our number one priority. That's why we are announcing additional chartered flights to help those who want to leave.
"I urge all British nationals still in Lebanon to register with the FCDO (Foreign Office) and leave the country immediately."
There are concerns in Whitehall that further military activity by Israel could result in the closure of the airport, cutting off the most straightforward exit route for British nationals in Lebanon.
If that happens the only option could be a military-led evacuation co-ordinated from the British bases in Cyprus.
Around 700 troops and Foreign Office and Home Office staff, including Border Force officers, have been deployed to Cyprus in case an emergency evacuation is needed.
