This advisory follows a US security alert detailing a reported threat to high-end hotels in Karachi.
The US Consulate General in Karachi has temporarily restricted visits by official US government personnel to the specific hotels.
Both the US State Department and the UK's Foreign, Commonwealth & Development Office (FCDO) cite risks including terrorism, potential armed conflict, and criminal/political violence in Pakistan, especially in Karachi.
Travellers are urged to avoid crowds, stay alert in areas frequented by tourists, maintain a low profile, and exercise caution if visiting.