KHARTOUM, Sudan (AP) — As explosions and gunfire thundered outside, Sudanese in the capital Khartoum and other cities huddled in their homes for a third day Monday, while the army and a powerful rival force battled in the streets for control of the country.

At least 185 people have been killed and over 1,800 wounded since the fighting erupted, UN envoy Volker Perthes told reporters. The two sides are using tanks, artillery and other heavy weapons in densely populated areas. Fighter jets swooped overhead and anti-aircraft fire lit up the skies as darkness fell.

The toll could be much higher because there are many bodies in the streets around central Khartoum that no one can reach because of the clashes. There has been no official word on how many civilians or combatants have been killed. The doctors’ syndicate earlier put the number of civilian deaths at 97.

The sudden outbreak of violence over the weekend between the nation’s two top generals, each backed by tens of thousands of heavily armed fighters, trapped millions of people in their homes or wherever they could find shelter, with supplies running low and several hospitals forced to shut down.

Top diplomats on four continents scrambled to broker a truce, and the UN Security Council was set to discuss the crisis.

In central Khartoum, sustained gunfire erupted and white smoke rose near the main military headquarters, a major battle front. Nearby, at least 88 students and staffers have been trapped in the engineering college library at Khartoum University since the start of fighting, one of the students said in a video posted online Monday. One student was killed during clashes outside and another wounded, he said. They do not have food or water, he said, showing a room full of people sleeping on the floor.

Even in a country with a long history of military coups, the scenes of fighting in the capital and its adjoining city Omdurman across the Nile River were unprecedented. The turmoil comes just days before Sudanese were to celebrate Eid al-Fitr, the holiday marking the end of Ramadan, the Islamic month of fasting.

The power struggle pits Gen. Abdel-Fattah Burhan, the commander of the armed forces, against Gen. Mohammed Hamdan Dagalo, the head of the Rapid Support Forces, a paramilitary group. The former allies jointly orchestrated an October 2021 military coup. The violence has raised the specter of civil war just as Sudanese were trying to revive the drive for a democratic, civilian government after decades of military rule.

Under international pressure, Burhan and Dagalo had recently agreed to a framework agreement with political parties and pro-democracy groups, but the signing was repeatedly delayed as tensions rose over the integration of the RSF into the armed forces and the future chain of command.

The US, the UN and others have called for a truce. Egypt, which backs Sudan’s military, and Saudi Arabia and the United Arab Emirates — which forged close ties to the RSF in recent years as it sent thousands of fighters to support their war in Yemen — have also called for both sides to stand down.