(CNN) An arrest warrant has been filed for Imelda Marcos after the former Philippines First Lady failed to appear in court at the end of her corruption trial, according to a court official.

The 89-year-old widow of former Philippines dictator Ferdinand Marcos was not present in court Friday when it was announced that she had been found guilty of seven counts of graft.

Despite her absence, Marcos was sentenced to a minimum of up to 11 years for each count, according to CNN affiliate CNN Philippines. She was acquitted on a further three counts of graft.

Marcos, a member of the Philippines House of Representatives, will be given 30 days to explain her absence, according to Lenina Alisuag, from office of the clerk of courts of the Sandiganbayan Court Fifth Division, which has jurisdiction over criminal and civil cases involving graft and corrupt practices.

The charges, filed in the 1990s, stem from companies set up by the family in Switzerland prior to her husband's ouster in 1986, CNN Philippines says. The former first lady held various positions in her husband's government during his 21-year regime.

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