Pakistan has “closed its airspace” to all air traffic, including commercial flights, after tensions flared with India.
It follows similar measures by Indian officials amid “heightened tensions” between the two states over Kashmir and Jammu.
Two Indian military jets were shot down on Wednesday (February 27) and two pilots captured. Pakistan has confirmed it carried out the strikes.
There were incidents of cross-border shelling on Tuesday, resulting in military and civilian casualties.
Earlier this month, 40 Indian troops were killed by militants in Kashmir. A Pakistani group has claimed responsibility for the attack.
Both countries lay claim to Kashmir, yet control only selected parts of the disputed territory.
Pakistan’s Civil Aviation Authority confirmed the closure of its airspace on Wednesday morning “until further notice”. Eurocontrol has acknowledged the closure.
The move has prompted the Foreign Office to update its travel advice for both India and Pakistan.
“There are heightened tensions between India and Pakistan, particularly in Jammu and Kashmir,” said the FCO.
“In response to these tensions, Pakistan has announced the closure of its airspace, effective until 11.59pm on February 28.
“There are no commercial flights operating to, from or within Pakistan at this time.
“You should check with your airline before travelling to the airport for flights to and from Pakistan.”
It adds in respect of India: “There may be disruption to air travel in Jammu and Kashmir and northern India at short notice.”