The talks of the Indo-US Contact Group on nuclear cooperation, which started yesterday, centred on the ticklish liability issue which has stalled the implementation of the agreements inked in 2005 between the then US President George Bush and former Prime Minister Manmohan Singh.
The Indian liability law holds the suppliers directly liable in case of a nuclear accident while countries like France and the US have asked India to follow global norms under which the primary liability is with the operator.
Another contentious clause in the liability law was unlimited liability for which international companies will find it difficult to get insurers.
The day-long talks have been extended by another day, officials here said.
The talks in London followed the second round in Vienna earlier this month and sources here indicated that there was "forward movement" in the last two rounds and the officials would build on that to achieve something "concrete".