A Chinese student at Brandeis University in US state of Massachusetts died Sunday, the Chinese Consulate General in New York confirmed Tuesday.

The student was found dead after returning from a gathering, with no obvious injury, the consulate general said, quoting updates from the university.

Police are investigating the cause of his death.

His family has been notified, the consulate general said, without giving more information.

In a separate development, an armed robbery was reported at Brandeis University Monday night, in which no one was hurt, according to campus police.

Police learned that "two non-community members had entered a student room, one threatened three students in the room with a gun, and then both fled campus," the university said Tuesday in a statement on Twitter.

The campus was placed on lockdown after the incident was reported. Campus and local police searched the campus and surrounding area, only to find no suspects, the statement said.

The lockdown was subsequently lifted, and the campus resumed normal operations, the university said.