This by @HRW still stands alone as the most forensic account of what happened that day:

Unacceptable statement by HRW.

Since May 2009, Egyptian border guards shot and killed at least 17 migrants from countries such as Eritrea, Ethiopia and Sudan as they tried to cross into Israel at or near the Sinai border. General Muhammad Shousha, the governor of North Sinai, was quoted after the killings of four migrants in September justifying the policy of shooting at the migrants as "necessary."

الطلاب يرون مبالغة في تقرير HRW