Investigators in Afghanistan are searching for an American and an Australian who were kidnapped in western Kabul, the city’s police chief told CNN.

The two men, lecturers at the American University of Afghanistan, were kidnapped Sunday evening when two gunmen stopped the car they were riding in, an Afghan security official told CNN.

One assailant broke the passenger-side window with his gun and took the two men away. A driver and bodyguard were left unhurt, the official said.

There has been no claim of responsibility.

The US Embassy in Kabul confirmed that an American citizen had been kidnapped near the university.