Tigrayan forces in northern Ethiopia say federal troops and their allies have launched coordinated attacks on all fronts.
They said heavy artillery, tanks, fighter jets and drones were being used against them.
A senior member of the Tigray People’s Liberation Front said Tigrayan forces were holding their ground.
Getachew Reda said the government offensive launched last week was now in “full swing”.
There has been no word so far from Addis Ababa.
A communications blackout means it is not possible to verify the information independently. Nearly two million people have been displaced in the 11-month war.