Knox family 'not concerned' prosecutors' appeal of her exoneration
Prosecutors in Italy lodged an appeal Tuesday of the acquittal of American student Amanda Knoxin the murder of British student Meredith Kercher.

A secretary for prosecutor Giuliano Mignini confirmed to CNN that the appeal had been filed, but said Mignini was not immediately available for comment.

The family of Amanda Knox released a statement sindicating that it was not worried about the new developments.

"We are not concerned about this appeal as Amanda’s innocence was clearly and convincingly proven in her appeal trial," the statement said. "This is simply another example of harassment by the prosecution against Amanda and makes this terrible, painful incident continue to go on for Amanda, Raffaele and their families."

Knox and her ex-boyfriend, Raffaele Sollecito, were convicted of murder in 2009 but were cleared when they appealed the verdicts in October.

The case gripped the attention of the public in the United States, Italy and Britain.

In legal paperwork published in December, the judge in the case wrote that the jury had cleared the pair for lack of evidence proving they were guilty.

"Even taken all together," the prosecution's evidence does not "prove in any way the guilt of Amanda Knox and Raffaele Sollecito for the crime" of killing Kercher, Judge Claudio Pratillo Hellman wrote.

Lawyers for Knox and Sollecito had focused on discrediting DNA evidence that played a role in the 2009 conviction. "Very little has changed," said Knox's attorney Theodore Simon.

Knox was 20 and Kercher was 21 when the two shared a home as they studied at the university for foreign students in Perugia, Italy. Kercher's semi-naked body was found in November 2007 at the home, with her throat slashed.

Sollecito, 23 at the time, was Knox's boyfriend, studying computer science at another university in Perugia.

Knox, who was initially sentenced to 26 years in prison, returned to her hometown of Seattle with her family following her release.

A third man, Ivorian drifter Rudy Guede, was convicted separately of the killing. Guede admitted having sexual relations with Kercher but denied killing her.