"Al-Bashir's regime decided to suppress the protests by force- that made us interfere", the spokesman said in a televised address.
The spokesman also said that Sudanese Defense Minister Awad Mohamed Ahmed Ibn Auf and National Intelligence and Security Service chief Salah Gosh stood down.
The transitional council was established on Thursday for a period of up to two years, after the Sudanese military removed Bashir, who had ruled the country for 30 years, from power amid months-long anti-government protests. The defense minister was initially appointed the head of the newly created body, but he resigned the very next day.
Rallies in Sudan, which have been going on since December 2018, were initially caused by the rise in bread prices, but protesters later changed their demands and called for the resignation of Sudanese President Omar Bashir.