A five-star Cape Town hotel has been blacklisted by the US consulate in the city after allegations of "multiple theft reports" from US officials staying there.

The hotel, the Westin Grand, is next to the Cape Town International Convention Centre.

In a message e-mailed to US citizens in South Africa and posted on the US embassy's website, the consulate said US government employees and contractors had been "directed" not to stay at the Westin until further notice.

"This directive was issued because of multiple theft reports from US government employees visiting the hotel," it said in the e-mail.

"The US mission in South Africa is investigating the situation in co-ordination with hotel administration and will advise all US citizens of any change in this policy," it said.

The hotel's chief operating officer, Friedrich Schaefer, said US government employees staying at the Westin Grand had alleged incidents of theft on August 11.

He said the matter was immediately investigated by hotel security and management, and the South African police were also informed.

However, the investigation was "inconclusive" and a meeting with the US embassy was arranged by hotel management for today.

"We take all allegations of theft extremely seriously, and this incident has been given full attention by hotel management," Schaefer said.

"Rigorous security procedures are in place. We greatly value our relationship with the US embassy, and hope to resolve this as a matter of urgency."

US consulate spokesman Nathan Holt said the consulate was "actively engaged with the Westin to resolve these issues".

Holt said the e-mail was distributed to the broader US community in South Africa as a "warden message", used by US missions to disseminate information about routine topics such as voter registration and passport procedures, and also to inform US citizens about threats to their personal security.

The Westin Grand, which was formerly known as the Arabella Sheraton, says on its web page that it offers "customised renewal experiences" that will "energise your mind, body, and spirit, making your stay especially memorable".

"Our aim is for you to feel not only rested, but also renewed and enriched when you check out."

Rates for a single, adult room plus breakfast range from R1900 to R4900 a night.