It is potentially the deadliest of the almost daily shootings that have been taking place recently near aid distribution sites.

At least 51 Palestinians were killed and more than 200 wounded in the Gaza Strip while waiting for U.N. and commercial trucks to enter the territory with desperately needed food, according to Gaza’s Health Ministry and a local hospital.

It did not appear to be related to a new Israeli- and U.S.-supported aid delivery network that rolled out last month and has been marred by controversy and violence.