The UK government will charter a flight from Oman in the coming days, prioritising vulnerable British nationals in the region amid continued strikes by Iran, the foreign secretary has said.

Yvette Cooper said the closure of the airspace and the ongoing threat of strikes from Iran, retaliating for US-Israeli attacks, meant the situation was “fast-moving”.

The charter flight will take off from Muscat “in the coming days”, Cooper said, adding that the government was working on increasing the capacity of flights able to depart from Oman.

She said 130,000 British nationals had registered their presence with the Foreign Office, allowing them to receive updates as the situation unfolds.

Speaking in the Commons, Cooper said airspace was still closed but that many British nationals stranded in countries in the Gulf, including the UAE, were receiving assistance from the local governments.

“I am in close contact with my counterparts across the region, speaking again yesterday with the UAE on the excellent support that they are providing and some of the departures that they are now securing as this becomes viable,” she said.

Cooper said that the government was “working with airlines on increasing capacity out of Muscat for British nationals”, and that a charter flight would fly from Muscat in the coming days, prioritising vulnerable nationals.

She said Britons in Oman would have to wait to be contacted by the Foreign Office (FCDO). “This is a very fast-moving situation. We have unprecedented numbers of British nationals in the region, and I will continue to update members and affected British nationals as the situation evolves,” she said.

No 10 said the FCDO had taken 2,700 calls from British nationals, half in the UAE. Citizens have registered to be kept informed from Bahrain, Israel, Kuwait, Palestine, Qatar and UAE.

Downing Street said the government remained in touch with commercial airlines, and contingency plans were being worked on.

Large areas of airspace over the region remain closed but some limited flights have begun to bring people back to the UK. On Monday afternoon, an Etihad Airways flight carrying stranded British nationals arrived at Heathrow airport, according to the flight tracking company Flightradar24.

Large international airports in the region have been targets of Iran’s retaliatory strikes, including Dubai’s international airport. Three leading airlines that operate at Dubai and Abu Dhabi airports – Emirates, Qatar Airways and Etihad – typically have about 90,000 passengers a day passing through those hubs.

Qatari airspace remains closed, with no flights taking off or landing at Doha airport.

On Tuesday the UAE government said its air defences had dealt with 186 missiles launched toward the country since the start of the US-Israeli conflict with Iran.

Israeli and US warplanes launched a fresh wave of strikes overnight across Iran, killing 787 people, according to the Red Crescent.