The military did not say where the incident occurred but it came hours after a local Syrian official said that a roadside bomb has exploded in the tense, mixed Arab-Kurdish town of Manbij that is not far from the border with Turkey.
The Pentagon announced earlier this year a record total of 6,172 sexual assault reports in 2016, compared with 6,082 the previous year. This was a sharp increase from 2012, when 3,604 cases were reported.
IS has risen to prominence in the country's civil war targeting both army recruits of the government and Shiites, which it considers heretics. The group's last major attack was a suicide bombing in the government stronghold of Aden last December, which killed 48 soldiers.
"In North Korea, our goal is denuclearisation. We cannot allow this dictatorship to threaten our nation or our allies with unimaginable loss of life. We will do what we must do to prevent that from happening. It will be done, if necessary -believe me," he said.
"One by one, the US military's most senior leaders have publicly — and bluntly — repudiated the racist violence that plunged Charlottesville into chaos Saturday, declaring the nation's armed forces as being unequivocally against hatred," The Washington Post reported.