Thirty four U.S. service members have been diagnosed with concussions, traumatic brain injuries (TBI) from an Iranian missile attack on U.S. troops stationed in Iraq, Pentagon spokesman Jonathon Hoffman said during a press conference Friday.

Some symptoms of TBI reported include “headaches, dizziness, and sensitivity to light… restlessness, nausea” many of which “develop over a period of time,” Hoffman noted.

“The DOD is committed to delivering programs and services intended to lead to the best possible outcomes for our service members who suffer any injury,” he said.

“Over the last two weeks, we have seen a persistent and dedicated effort by our medical professionals on the ground in Iraq, Kuwait, and Germany to diagnose and treat any and all members who needed assistance,” he added. “We wish all these members well and we are dedicated to ensuring they have the support and treatment they need for a full recovery.”

The evaluation and treatment of the injured service members is being conducted as a wide scale effort. Eight of the injured service members moved to Germany are being transported to the U.S. Nine remain in Germany and are being evaluated and treated in the country. One was transported to Kuwait and “has returned to duty in Iraq.” Sixteen others stayed in Iraq and “have returned for duty.”

During a trip to Davos, Switzerland for the World Economic Forum, President Donald Trump said he had knowledge of the injuries. “I heard that they had headaches and a couple of other things, but I would say and I can report it is not very serious,” Trump told reporters.

The attack occurred earlier this month when Iran fired dozens of missiles at Ain al-Asad and a base near Erbil. It was their revenge for the U.S. taking out Iran Quds Force General Qassem Soleimani, a known terrorist.