According to Hanoi police, the indicent occurred at around 11.19 pm on May 5 at the porridge shop at 5 Hang Voi Street in Hoan Kiem Ward.
Initial reports indicated the business adjoined a residential building at the rear, where four people were trapped inside.
Authorities swiftly deployed fire and rescue teams from Units 7, 8 and 9 under Hanoi’s Fire Prevention, Fighting and Rescue Police Department.
At the scene, firefighters determined the blaze had broken out on the ground floor, producing heavy smoke and toxic fumes, with a risk of spreading to nearby homes.
Rescue crews using breathing apparatus entered the upper floors of the adjoining building to evacuate those trapped, while other teams tackled the blaze from multiple directions to prevent it spreading.
The fire was fully extinguished by around 11.45 pm with support from local authorities, ward police and residents.
No fatalities were reported, and the blaze was contained before it could spread to neighbouring properties or upper floors of the building.
All four trapped victims were rescued safely and handed over to medical workers and local police for health checks and monitoring.
Authorities are investigating the cause of the fire.