Like many Sudanese barricaded in their homes - avoiding windows for fear of gunfire - Twitter user Mujtaba Musa turned to social media, asking over 200,000 followers to "share calls for help" to "try to connect those in need."
WhatsApp groups crowd-source needs, while medical professionals upload first-aid video tutorials, and others in the city of more than five million people work together to provide any support they can.
Since fighting erupted on Saturday, with fighter jets launching air strikes in the city and artillery fire in densely populated areas, civilians have become increasingly desperate, with dwindling food supplies, power outages, and a lack of running water.
On Twitter, under the Arabic hashtags like #Khartoum_Needs, residents of each district have been mobilizing support and solidarity.
The messages are heart-breaking: Kholood needs baby formula, Hisham is looking for a car, and a third anonymous user pleads for a phone credit top-up to call his family.
Others provide advice: what to put in an escape bag, which doctors to call, or how to handle a panic attack.
Interactive maps and live updates aim to guide those trying to evacuate through streets with no fighting - but all are carefully timestamped by the minute - because things can change in a second.
They have since spent the final days of the Muslim holy month of Ramadan sheltering as tanks roll through the streets, buildings shake and billowing smoke from fires triggered by the fighting turned the sky ashen grey.
With both doctors and patients unable to get to hospitals, medical professionals have begun adding their information to a website called Khartoum Medical.
It includes their location - if those in need can move on the dangerous streets - as well their contact details to help other patients over the telephone or text.
With pharmacies closed since Saturday, it is not just those injured in the fighting needing help, but also those unable to get their regular medication, such as insulin.
"We should find a pharmacist, create a (WhatsApp) group, and send him prescriptions," Twitter user Khalid Saad suggested to his 80,000 followers.
One volunteer, he wrote, can get the medications, and everyone splits the cost.
Another widely shared posts calling for an ambulance to transport two dead bodies "whose car was hit by a rocket."
Since fighting erupted on Saturday, with fighter jets launching air strikes in the city and artillery fire in densely populated areas, civilians have become increasingly desperate, with dwindling food supplies, power outages, and a lack of running water.