Matsya Purana 130.28

130.28

tadāsurairdarpitavairimardanairjanārdanaiḥ śailakarīndrasannibhaiḥ.
babhūva pūrṇaṃ tripuraṃ tathā purā yathāmbaraṃ bhūrijalairjalapradaiḥ.. 130.28 ..

When the sons of Diti, of unrivalled valour, and the great enemies of Indra heard that the Dânava Maya, of wonderful valour and deeds, had built such a fortress they came in hundreds and thousands and took refuge there That Tripura fort, then became quite full of the Asuras, the tormentors of people and the destroyers of their enemies, and it looked gigantic like elephants and mountains as if the sky had been overcast with dark clouds about to shower rains—27 28