Doubts are growing over G4S move to buy £5.2 billion ISS

"The jury's still out," investors said today, as rising concerns about G4S's £5.2 billion deal to buy Danish outsourcer ISS sent the Olympic security provider's shares downwards once more.

G4S shares, off 1.8p at 240.5p, are still trading 15% lower than the price before its acquisition announcement last week, throwing doubts on chief executive Nick Buckles' claims that investors just needed time to digest the deal.

Buckles was meeting shareholders in Copenhagen today, trying to win over the Scandinavian investors he inherited from G4S's Group 4 merger.

But analysts said G4S backers were showing "increasing nervousness" about the deal and its related £2 billion rights issue. One leading G4S investor said: "It is a hell of a big deal and the jury's still out.

"It's something of a departure from their stated strategy and I'm not sure this is the right environment for a deal that bets the ranch."