Egypt banned Boeing 737 Max aircraft from its airspace as a “precautionary measure” to ensure the safety of passengers, the Civil Aviation Authority said Wednesday.

It takes the tally of countries banning the Max 8 or the wider Max range to 45, further isolating the US and Canada, which are still allowing the jets to fly.

The Egyptian Authority tied its decision to the “lack of clarity” surrounding the causes of the Ethiopian Airlines crash. EgyptAir, the country’s national carrier, doesn’t own any 737 Max aircraft, but the jet will now not be allowed to land or takeoff in the country.

Egyptian authorities are working on assessing the safety of this model along with international aviation authorities, the manufacturing company and the relevant safety agencies, the statement added.