We have examined exclusive Al Jazeera video filmed close to that second location at the rear of the convoy, about half a kilometre south of the roundabout.
Volleys of gunfire can be heard and people are seen scrambling over lorries and ducking behind the vehicles. Red tracer rounds can be seen in the sky.
Mahmoud Awadeyah said the Israeli vehicles had started firing at people when the aid arrived.
"Israelis purposefully fired at the men... they were trying to get near the trucks that had the flour," he said. "They were fired at directly and prevented people to come near those killed."
At least 112 Palestinians were killed as crowds rushed around lorries delivering desperately needed food aid in the small hours of Thursday morning, according to the Hamas-run health ministry.
This footage, posted on Instagram at 23:30 local time on 28 February, shows some of the hundreds of people huddled round fires as they await a humanitarian aid shipment.
The UN is warning of a looming famine in northern Gaza, where an estimated 300,000 people are living with little food or clean water - the area has received very little aid in recent weeks.
At about 04:00 local time on Thursday 29 February, a convoy of lorries carrying the aid from Egypt passes through an Israel Defence Forces (IDF) location, making its way north along al-Rashid Street.
The IDF's chief spokesperson, Daniel Hagari, said that at about 04:45 lorries in the convoy were surrounded by crowds of people as the vehicles approached the Nabulsi roundabout, on the south-western edge of Gaza City.
It follows concerns raised on Tuesday by a senior UN official who warned that more than half a million people across the Gaza Strip faced catastrophic levels of food insecurity.
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