This was further added on BBC
The IDF says troops fired on the hostages in the northern town of Shejaiya after they were mistakenly identified as a threat.
During subsequent searches and checks in the area, "suspicion arose over the identities of the deceased", the statement says, and their bodies were transferred to Israeli territory for examination.
The statement says "immediate lessons from the event have been learned" and passed on to all IDF troops in the field.