A UN investigation found that US and UK-manufactured weapons or parts were likely used to bomb British doctors working for British and American organisations in Gaza in January, the organisations involved have highlighted.
Medical Aid for Palestinians (MAP) and the International Rescue Committee (IRC) also said this week that Israeli officials have offered six different explanations about why the residential compound housing their staff was hit.
The compound, which was not close to any other buildings, was struck around 6am on 18 January by an F-16 jet which "most likely'" fired a 1,000-pound "smart bomb", the UN investigation found.
A month earlier, the Israeli military had given the British defence attache assurances that the site, which had been designated a safe zone and was located in the southern Gaza town of Al-Mawasi, had been marked as a protected, humanitarian area.
The strike left several staff members and a bodyguard with non-life-threatening injuries, severely damaged the compound and was said to have forced the organisations to stop taking foreign doctors into Gaza as the healthcare system collapsed.