Zandile Christmas Mafe, 49, was arrested around the parliament complex after the fire broke out on January 2.
Hundreds of homes had been washed away in the iron-roof informal settlements just outside the country's East London city, especially the Mdantsane township, reports local media.
Allegations against ex-president Jacob Zuma included "state capture" in which he allowed businessmen to plunder state coffers during his nine years in office.
No casualties have been reported in the fire, but the damage to the nation's parliament has shocked the country.
Firefighters were still working on “hotspots” in the National Assembly building more than 24 hours after the fire started, Cape Town Fire and Rescue Service spokesman Jermaine Carelse said.
There was no indication of what may have started the mass of flames that could not be contained, though an arrest was made.
Life-size posters of Tutu, with his hands clasped, are placed outside the St George's Cathedral in Cape Town, where the number of congregants is restricted in line with Covid-19 measures.
A South African study with 15 individuals infected with the Omicron variant, some vaccinated and some not, shows promising recovery. The subjects are likely to demonstrate increased immunity to the Delta variant.
The lying in state of the Anglican bishop and theologian Desmond Tutu, known for his work as an anti-apartheid, has been extended to two days "for fear there might be a stampede".
He demonstrated consistency and bravery in the face of repression and injustice, whether in apartheid South Africa, Palestine, or Iraq.
World mourns South Africa's anti-apartheid hero, Archbishop Emeritus Desmond Tutu who died at the age of 90.
South Africa's Desmond Mpilo Tutu was a leading figure in the anti-apartheid struggle and an international defender of human rights and peace.
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