France’s sports minister said Wednesday that there was no “specific” terror threat to the Paris Olympics and that organisers were planning to go ahead with the opening ceremony on the river Seine.

An attack on a Moscow concert hall last month which left 140 people dead has revived fears for the Paris Games which begin on July 26.

“Today there is no specific terror-related threat targeting the Olympic and Paralympic Games,” Sports Minister Amelie Oudea-Castera told the France 2 channel.

She said the opening ceremony on the Seine remained the “main plan” but suggested that an alternative was being prepared behind the scenes.

Instead of parading through the athletics stadium at the start of the Games, sporting delegations are set to sail down the Seine on a flotilla of river boats in front of up to 500,000 spectators, including people watching from nearby buildings.

“It’s not because we are not talking about a Plan B that there isn’t one,” Oudea-Castera added.

All countries have said they plan to take part in the open-air river parade, including the most risk-averse such as the United States and Israel.

The Olympics have been attacked in the past — most infamously in 1972 in Munich and again in 1996 in Atlanta — with the thousands of athletes, huge crowds and live global television audience making it a target.