On Tuesday, Hanoi government asked police to tighten security at the city's sleek new museum due to a raft of vandalism and theft, local news website VietNamNet reported.
"Sabotage and equipment theft has occurred at the museum," the city announced in a statement sent to the police, without specifying what was lost.
Authorities said visitors at the museum during Hanoi's millennial anniversary damaged potted trees (some worth billions of dongs) in the museum yard. Equipment was also stolen, they said.
Hanoi police have been asked to cooperate with Hanoi Department of Culture, Sports and Tourism to beef up security at the facility, which houses more than 50,000 exhibit items.
The upgrade will be no easy task as the museum covers almost 54,000 square meters.
The Hanoi Museum cost a total of VND2.3 trillion (US$118 million) to build and opened Wednesday last week (October 6) after two decades of planning and construction.