Reporting that African refugees are detained upon first arriving in Israel because "Sudan is technically an Arab country" is somewhat misleading. They aren't being detained simply because they may (or may not) be from an Arab country. They are being detained because, as any country concerned with it's national security, they have to be able to verify the identities of those entering their borders. Since Sudan, and other Arab-African countries, have elected not to have diplomatic ties with Israel, this complicates issues surrounding identity verification. This is just one of many reasons why, out of concern for national interest rather than spite, these people are being detained on arrival.