Some airlines are canceling flights to Cairo amid fears to a terrorist attack targeting the aviation industry.
British Airways suspended a week's worth of flights to Cairo as a precaution. German airline Lufthansa scrapped flights to Egypt's capital this weekend, but they have since resumed.
The British government said: "Additional security measures are in place for flights departing from Egypt to the UK. You should co-operate fully with security officials at airports."
Read more about the security threat here.