"So far three people have been arrested and two other suspects are expected to hand themselves over to the Hawks", spokesperson Brigadier Hangwani Mulaudzi said.
Zuma's silence has fuelled speculation of a power struggle behind the scenes with deputy president Cyril Ramaphosa, whose election to the head of ANC in December marked the beginning of the end of Zuma's tenure.
The Hawks have confirmed that they have raided Gupta-linked properties around Gauteng and arrested three people with further arrests planned.
Besides the pressure from the ANC, Zuma is facing a no-confidence motion in parliament set for February 22. "They have not been arrested or charged with anything and are still free as we speak‚" he told TimesLIVE.
Speculation is rife that the raid is in connection with the Gupta family's alleged involvement in state capture.
Zuma and the Guptas - a family of wealthy Indian-born businessmen - deny any wrongdoing.
The Guptas lawyer‚ Ahmed Gani‚ said his clients had not been arrested.
Finance Minister Malusi Gigaba said Zuma was to speak at 0800 GMT (7pm AEDT) and satellite trucks were in position at Pretoria's Union Buildings, the seat of government.
In addition, the source said that the Hawks had yet to apprehend Duduzane Zuma, who was reportedly in discussions with them today to hand himself over as well.
The DA is also taking Public Protector Busisiwe Mkhwebane's report on the Vrede dairy project in the Free State on review, the party's leader Mmusi Maimane announced on Monday. Under South African law, suspects can not be named until they appear in court.
"The Hawks' Serious Corruption Crime Unit is now conducting ongoing operations at various addresses in Gauteng, including a residential premises in Saxonwold near Johannesburg", said Mulaudzi.
The raid by the specialist Hawks police unit on the family home of the Guptas came a day after the ruling ANC ordered Zuma to step down as head of state after nine years in office dogged by scandal and a stagnant economy.