Fifteen Tigray fighters were found dead in a border river following fierce clashes between Ethiopian troops and rebel forces.
Sudanese medical workers recovered the bodies near Hamdayet while treating six wounded refugees escaping the sudden surge of violence.
Heavy gunfire and thundering explosions echoed across the frontier as desperate families fled into neighboring Sudan for refuge.
Tigray rebels accused the Ethiopian government of launching a massive ground offensive, though state authorities have maintained complete silence.
Rebel leaders confirmed the weekend battles had ended by Sunday but withheld official figures regarding their overall military casualties.
The fresh outbreak of bloodshed threatens to plunge northern Ethiopia back into chaos after a devastating two-year conflict.
That previous war claimed over 600,000 lives before a fragile peace treaty temporarily halted the widespread destruction across Tigray.
Strained relations between Ethiopia and Sudan deepen as both nations exchange bitter accusations of harboring rival armed militias.
This border escalation further destabilizes Sudan as the neighboring country battles its own catastrophic civil war and displacement crisis.
