Four members of a family convicted over a series of bomb blasts in India?s western city of Mumbai in 1993 are due to be sentenced.

They were found guilty on Tuesday in a case that has 123 defendants. Other verdicts will be announced in stages. A total of 257 people were killed and 713 injured in the blasts.

The man thought to be the mastermind of the plot, underworld don Dawood Ibrahim, has not been caught and is believed to be living in Pakistan. On Tuesday, Judge Kode found family members Yaqub Memon, Yusuf Memon, Isa Memon and Rubina Memon guilty of conspiracy and abetting a terrorist act.They are related to another main accused, Tiger Memon, who has not been caught and is believed to be living outside India. Correspondents say Tiger Memon owned a restaurant in Mumbai and was allegedly closely associated with Dawood Ibrahim.

Bollywood star, Sanjay Dutt, is also among the accused. Dutt was arrested 13 years ago on terrorism charges and spent nearly two years in jail before the Supreme Court released him on bail. The BBC?s Zubair Ahmed in Mumbai says there have been few trials in India?s legal history to match this one. It has taken more than a decade, with evidence from more than 600 witnesses.

The bombings are believed to have been carried out by one of the city?s notorious underworld crime syndicates, which were then dominated by Muslims. Their motive is said to have been to avenge the deaths of Muslims killed in religious rioting in the city during the preceding months.

Most of the accused men have been languishing in jail for the past 13 years. Lawyers have criticised the length of the trial. The case has taken so long that 12 of the accused have died and others have been imprisoned for so much longer than their likely sentence that a guilty verdict may still result in them walking free.