New Dehli, India ? More than 13 years after the deadliest terrorist incident in Indian history, a court in Mumbai handed down the first major conviction in the case Thursday.

Judge Pramod Kode found Mohammed Shoaib Ghansar guilty of parking an explosives-laden scooter in Zaveri Bazaar, the city’s bustling jewelry district. That explosion, which killed 17 people and injured 57, was one of 10 bombs set off over two hours that killed 257 people on March 12, 1993, in Mumbai.

Prosecutors are expected to seek the death penalty for Ghansar for a day of mayhem that’s considered the starting point for subsequent years of Islamist violence.