TEL AVIV, Israel — An Israeli military investigation into its naval takeover of a Gaza-bound flotilla six weeks ago found that it was plagued by errors of planning, intelligence and coordination but that the killings of nine Turks on board were justified, according to an official summary of the findings released Monday.

Giora Eiland, a retired major general who led the probe, presented his classified findings to the military chief of staff; they were not released to the public. But a statement issued by the military said that the investigators faulted the military for not knowing who was on board one of the ships.

A senior officer involved in the report said that at least 65 Turkish Islamic militants armed with metal sticks and knives were on the flotilla’s main ship, and had vowed to fight any effort by the Israeli navy to board.