Egypt is closing its airspace to Qatari planes in a growing diplomatic row.
Egypt is closing its airspace to Qatari planes in a growing diplomatic row, with Saudi Arabia and Bahrain expected to do the same today.
Several countries have cut ties with Qatar, accusing it of supporting terrorism in the Gulf region.
Qatari nationals in Bahrain, Saudi Arabia and the UAE have been given two weeks to leave.
Qatar denies backing militants and its foreign minister has called for "a dialogue of openness and honesty".
Egypt said it was closing off its airspace to Qatar from 04:00 GMT today "until further notice".
Travel disruption is expected as the airport in Doha, Qatar's capital, is a major hub for international flight connections.
Airlines affected will include Qatar Airways, Etihad Airways and Emirates.
Qatar, which is due to host the football World Cup in 2022, said the decision would "not affect the normal lives of citizens and residents".
Iran, Turkey and the US have called on all sides to resolve their differences.
Sudan's foreign ministry also called for dialogue and said the country was "fully ready to undertake all efforts in order to achieve calm and reconciliation that would help serve the interests of the people of the region".
Qatar's stock market closed down 7.27% on Monday.