Police in Tieu Can Commune said two residents reported the sighting after spotting the animals while exercising along the Tieu Can River near a bridge construction site on Friday evening.
The pair recorded the crocodiles on their phones before alerting police, who later coordinated with local agencies to inspect the area and devise a response plan.
Authorities are monitoring the site and have urged residents to stay away from the riverbank, avoid swimming or fishing in the area, and keep children under close supervision.
Police urged people to avoid the riverbank, refrain from swimming or fishing, keep children under close supervision, and report any further crocodile sightings to local authorities.