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By Fazul Rahim

An American professor and his Australian colleague have been kidnapped in Afghanistan's capital, an official at their university told NBC News.

The pair were snatched as they sat in their car Sunday night following classes at the American University of Afghanistan in Kabul. They have not been named publicly on the request of authorities.

A man bikes past the American University of Afghanistan in Kabul on Monday.Rahmat Gul / AP

An official from the university told NBC News that the campus has been closed for the day amid the ongoing situation. The official requested anonymity because he was not authorized to speak to the press.

Attempts to recover the kidnapped professors are underway, Kabul police chief Gen. Abdul Rahman Rahimi confirmed to NBC News. He declined to comment further amid the ongoing investigation.

No group has claimed responsibility for the kidnapping.

The State Department said it was aware of reports an American had been kidnapped but did not provide further comment.

Australia's Department of Foreign Affairs and Trade issued a statement confirming "the apparent kidnapping" of one of its nationals, saying it would not comment further "due to privacy and security considerations."

In April, an Australian charity worker in her 60s was kidnapped by armed men in Kabul. Her whereabouts remain unknown.

The Associated Press contributed.