Pop star-turned-MP Bobi Wine is heading back to Uganda, where he's facing treason charges, a few weeks after he traveled to the USA for medical treatment.
Kyagulanyi's worldwide lawyer, Robert Amsterdam, condemned his client's "illegal detention" which he said was "based on the fear of the power of the people".
"They have not given any reasons for the arrests", Basalirwa said, adding that he had been ordered to turn back.
Kyagulanyi has pleaded not guilty to treason charges.
"Well, for your information, no single family member will receive me at the airport; I will find them home coz [because] I know where home is. There are 40 million people who need hope so I will go and meet them no matter what", Wine told the Guardian.
On Thursday, helicopters were seen above Entebbe International Airport south of the capital Kampala a day after authorities banned rallies to welcome Kyagulanyi home from the United States, where he received treatment for injuries he said were sustained during torture by security forces. He denies wrongdoing. His next court appearance is October 1.More news: Machines will do more work than humans by 2025, says the WEF
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In the past returning opponents have been greeted by large crowds that turned into a slow hours-long procession towards the capital marked by clashes between police and supporters. "His brother Eddie has been detained", Kyagulanyi's lawyer, Nicolas Opiyo, confirmed to CNN on Thursday.
Longtime opposition leader Kizza Besigye, who has been arrested many times over the years, said on Twitter that it is likely Ssentamu "will now be blockaded at home till further notice".
The self-declared "ghetto president" told the BBC after his win that he represented a new generation: "I am going to stand up for issues. Like I said, we must get our freedom or we shall die trying to get it", Mr Kyagulanyi said.
Ssentamu, who clutched a cane and said he still felt pain and walks "with hardship", plans to say more at a press conference on Saturday.
Ssentamu has a big following among poor, unemployed young people in urban areas.
He says he was tortured in custody after being arrested last month.