Hundreds of protesters entered the army headquarters in capital Khartoum on Saturday in one of the biggest anti-government demonstrations in the last four months.
Security forces tried to disperse the protesters using tear gas.
The protesters demanded President Omar Al-Bashir to step down.
Eyewitnesses told Anadolu Agency that a huge crowd had gathered around the headquarters asking the army to intervene and overthrow the regime.
Sudan has been shaken by protests since last December, with demonstrators demanding the departure of al-Bashir, who has ruled Sudan since 1989.