Some of the world's biggest banks and other financial-sector firms have been quick off the blocks in playing their part in helping tackle the aftermath of the Haiti earthquake that struck on Tuesday.

Several banks have this week pledged outright cash commitments to humanitarian relief and recovery efforts already underway in Haiti, also urging their staff to make personal donations on top, while other forms of support for the relief effort announced in the days since the tragedy struck include donations of trading commissions and staff charity days to encourage further giving.