Uganda's government says it "will continue to suppress" the public activities of homosexuals and a rehabilitation program is being developed to allow them to "lead normal lives again".
Ugandan police last week arrested about 20 people attending a gay pride event at a nightclub in the capital, Kampala.
They were questioned and released hours later, although some said they had been assaulted by police officers.
"The police ordered the inmates to beat me," one activist, Pepe Onzima, said.
Simon Lokodo, a Ugandan minister in charge of ethics and integrity, told reporters that gay pride activities are being organised "with the influence of some foreign forces" he didn't name.
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He also accused gay people of trying to promote themselves.
Homosexuality is criminalised in Uganda, as in many African countries.
A colonial-era law proscribes such sex acts "against the order of nature".
Gay leaders say the LGBTI community faces discrimination, violence and extortion.
Frank Mugisha, a prominent gay rights leader in Uganda, said on Twitter that LGBTI Ugandans will continue to hold public events despite Lokodo's order.
Lokodo, a former Catholic priest who condemns homosexuality, has previously been accused of leading efforts to foil the public activities of LGBTI Ugandans.
He said a program has been developed to "rehabilitate members of the LGBT community, with the ultimate aim of giving them a chance to lead normal lives again".
Many Ugandans say they despise homosexuality and believe it is imported from the West.
In 2009, a Ugandan lawmaker introduced a bill that prescribed the death penalty for some homosexual acts, saying he wanted to protect Ugandan children.
The proposed bill prompted international condemnation, and a less severe version passed by lawmakers was rejected by a court as unconstitutional.
