Police found two bombs at Mumbai’s main train station nearly a week after they were left there by gunmen behind the attacks – in a stunning new example of the botched security that has become a major issue in India since the deadly three-day siege.

The gunmen who attacked Mumbai set out by boat from Pakistan’s port of Karachi, a top police official said, as the US secretary of state headed today to India in Washington’s efforts to defuse tension between the two nuclear rivals.