After Diwali this year, 135 offices had opened in SDB, of which 26 are run by Mumbai-based businessmen, who have either shifted or expanded their business to Surat.

Source: https://indianexpress.com/article/cities/ahmedabad/worlds-biggest-workspace-surat-diamond-bourse-launch-tomorrow-9070382/

Putting a rocket motor under an SDB creates a weapon that goes a lot further than a normal MLRS / HIMARS round, so my suspicion is that this is what the UA is using.

Source: https://japantoday.com/category/world/Ukraine-says-it-has-retaken-territory-near-embattled-eastern-city-of-Bakhmut