Prosecutors in the US have said that Backstreet Boys singer Nick Carter will not face charges over an alleged sexual assault in 2003 because the statute of limitations for the alleged offence has expired. Carter has denied the allegation.

The Press Association reports that in February, the Santa Monica Police Department in California said a woman had filed a report alleging that Carter sexually assaulted her in 2003.

In August, the Los Angeles County District Attorney said it was reviewing the case, with a spokesman saying on Tuesday that the District Attorney would not prosecute Carter over the alleged sexual assault.

The spokesman said the statute of limitations for the alleged offence expired in 2013.

Last November, when the allegation was first made public, 38-year-old Carter released a statement, saying he was "shocked and saddened" by the claim. 

"It is contrary to my nature and everything I hold dear to intentionally cause someone discomfort or harm," he said.