Online gambling group PartyGaming issued a warning yesterday that its full-year underlying profits would be below expectations.

The reason given was that the company had to invest heavily in attracting new players following the US ban on online gaming.

The Gibraltar-based group saw the number of non-US players rise to 538,000 in the first quarter, compared to 418,000 in the previous quarter. Revenues rose 26 per cent to $94.8m (£47m).

Despite this, the group said that its rebuilding investment would hit full-year figures. New players from outside the UK, mainly Europe, were spending less than former US players.