Read the article. The officers ordered the men to stop. They did not stop. There is no obligation to fire a warning shot. There isn't even an obligation to order illegals to stop. I thought that in giving an order to stop, the Egyptians were being excessively cautious.
Someone enters your territory illegally, shoot firs; questions later.
You're an idiot. Any reason the infiltrators could possibly have for being there was nefarious in the first place. I only wish Israeli police were as efficient.