Seven bombs killed more than 160 people and wounded hundreds in packed commuter trains and stations during rush hour Tuesday evening in the Indian city.

"New Zealand joins with the rest of the international community in utterly condemning this deplorable act of terrorism," said Peters.

"No grievance can justify such a cowardly attack. The blasts were clearly coordinated in order to cause as many deaths and injuries as possible to innocent people," he said. "We can only hope that the Indian authorities will be able to quickly identify those responsible and hold them to account."

Peters said it was too early to say if any New Zealanders had been caught in the blasts. However, New Zealand's Honorary Consul in Mumbai and staff from the High Commission in New Delhi were continuing to work closely with Indian officials to clarify the situation.