According to the BBC, the Sudanese security forces opened fire on the protesters, killing at least one person and wounding several others.
"Now an attempt is taking place to disperse the sit-in," said a short statement from the Sudanese Professionals Association, the group which is spearheading nationwide protests.
Local activists reported on Monday that protesters have begun burning barricades and tires in an attempt to fend off the security forces.
The Sudanese military has yet to issue any statement regarding Monday's violence.
Since the resignation of long-time President Omar Al-Bashir, Sudan has been governed by the army-led Transitional Military Council (TMC). However, their rule over the country has further fueled the demonstrations, with protesters taking to the streets to demand they transfer power to the people.
The TMC has maintained that they would maintain control over the country until elections were held, but the demonstrators are demanding the immediate transfer of power.