Organizers cancel U.K. Rihanna concerts

Two of Rihanna's upcoming concerts in Britain have been canceled.

The Umbrella singer was scheduled to perform in sports stadia in Cardiff, Wales and Sunderland, England in June (16), but the gigs will not go ahead due to logistical reasons.

Gary Hutchinson, the commercial director of Sunderland AFC, whose Stadium of Light was due to host the pop superstar, apologized to disappointed fans for the cancellation, saying, "Unfortunately this is something that can happen with major tours and naturally we are sorry for those concert-goers who were looking forward to the show."

The U.K. cancellations come after the postponement of the start of the star's Anti tour from 26 February (16) to 12 March (16) due to "production delays".

Rihanna was also forced to miss the Grammy Awards on Monday (15Feb16) due to illness.

A concert in Coventry, England, has also been put back from 14 to 25 of June (16), while her dates in Glasgow, London, and Manchester in England will go ahead as planned.