The number of us troops suffering from traumatic brain injuries (TBI) after an Iranian attack on a US base in Iraq in January has risen to 109, according to US officials.
The figure is a significant increase from the 64 injured service members previously reported by the pentagon.
President Donald Trump initially said no Americans were injured in the raid.
The attack on 8 January came amid tensions over the US killing of an Iranian general.
Nearly 70% of the injured service members have returned to their duties, the pentagon added in its statement.