The school said on its Facebook page Monday that its Kabul campuses will remain closed Monday and Tuesday, but did not explain why at that point. Regional centers were operating as normal, the Facebook page said.

Officials at the university could not be immediately be reached for comment.

Confirmation

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

Embassy security officials are working with Afghan law enforcement and the school to assist in the investigation into the kidnapping, embassy spokeswoman Susan C. Doman said.

A spokesperson at the Australian Embassy in Afghanistan has confirmed "the apparent kidnapping of an Australian in Kabul."

"We continue to advise Australians not to travel to Afghanistan because of the extremely dangerous security situation, including the serious threat of kidnapping," the spokesperson said.

Both the US and the Australian officials said they can't give more precise details because of "privacy" concerns.

There has been no claim of responsibility.

Attack last week injured tourists

The incident comes amid a violent spring and summer in the central Asian country.

And a rash of kidnappings and Taliban bombings have heightened security fears in Kabul. US and other diplomats have been barred from traveling by road the short distance from the city's international airport to their diplomatic missions. Instead, they've been ferried by helicopter.

Many countries, including the US and UK, have longstanding travel advisories warning against all but essential travel to Afghanistan due to the security situation throughout the country.