OSAKA (Kyodo) The March 11 disaster has delayed the start of merger talks between Tokyo Stock Exchange Group Inc. and Osaka Securities Exchange Co.

The heads of the two bourses revealed separately on March 10, the day before the quake-tsunami disaster, that they were mulling integration, but they could not arrange direct talks in March as initially intended, sources said Thursday.

The delay has been caused as politicians and government financial regulators are focusing on the immediate challenge of addressing the impact of the disaster as well as the subsequent nuclear crisis, they said.