Washington (CNN) Fifty US military personnel have now been diagnosed with concussions and traumatic brain injuries following the Iranian missile attack on US forces in Iraq earlier this month, according to a statement Tuesday from the Pentagon.

That's an increase of 16 from late last week when the Pentagon said 34 cases had been diagnosed.

"As of today, 50 U.S. service members have been diagnosed with TBI," Pentagon spokesman Lt. Col. Thomas Campbell said in the statement.

"Of these 50, 31 total service members were treated in Iraq and returned to duty, including 15 of the additional service members who have been diagnosed since the previous report. 18 service members have been transported to Germany for further evaluation and treatment. This is an increase of one service member from the previous report. As previously reported, one service member had been transported to Kuwait and has since returned to duty," the statement added.

Several Pentagon officials told CNN that the number of diagnosed cases is likely to continue to change. Approximately 200 people who were in the blast zone at the time of the attack have been screened for symptoms.

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