The Israeli military has provided new details that changed its initial account of the killing of 15 emergency workers near the southern Gaza city of Rafah last month, but said investigators were still examining the evidence, Reuters reports.

The military initially said soldiers had opened fire on vehicles that approached their position “suspiciously” in the dark without lights or markings. But video footage showed emergency workers in their uniforms and clearly marked ambulances and fire trucks, with their lights on, being fired on by soldiers.

An Israeli military official said last night that the investigators were examining the video and conclusions were expected to be presented to army commanders yesterday.

He said the initial report received from the field did not describe lights, but said investigators were looking at “operational information” and were trying to understand if this was due to an error by the person making the initial report.

“What we understand currently is the person who gives the initial account is mistaken. We’re trying to understand why.”