United Nations: UN Secretary-General Ban Ki-moon on Wednesday strongly condemned the bomb attacks in Mumbai, saying no cause or grievance can justify the indiscriminate violence against civilians, a newspaper reported.

"The secretary-general condemns the attacks that have killed and injured many on Wednesday in Mumbai," said a statement issued here by his spokesperson.

"No cause or grievance can justify indiscriminate violence against civilians," it quoted Ban Ki-moon as saying.

The secretary-general expressed his solidarity with the government and people of India, and extended his sincere condolences to the families of the victims, the statement added.

Three bomb attacks that occurred within minutes of each other in Mumbai's Zaveri Bazar, Opera House and Dadar on Wednesday, left 21 people dead and over 140 injured.