Maharashtra Chief Minister Sushilkumar Shinde on Monday night vowed to punish the perpetrators of the bomb blast in a BEST bus in Ghatkopar, which four people were killed and 31 injured.

He said his government had been strict in dealing with the people who were involved in an earlier blast at Ghatkopar.

Chronology of bomb blasts in Mumbai since December 2002

"Ham un logon ko nahin chodenge (we won't leave those people)," the chief minister told NDTV India.

Shinde said his government will 'ruthlessly' pursue the perpetrators.

Recent bomb blasts in Mumbai: Ghatkopar blast | Vile Parle blast | Mulund blast