PHILADELPHIA — The Philadelphia-area woman who supported violent jihadists under the online screen name “Jihad Jane” was sentenced Monday to 10 years in federal prison.

U.S. District Court Judge Petrese B. Tucker described acts undertaken by Colleen LaRose — including helping plot to assassinate in 2009 a Danish cartoonist who had offended some Muslims — as “gravely serious.”

But Tucker declined to impose a multidecade sentence sought by prosecutors.

Pleading for clemency, LaRose, wearing a dark headscarf and green prison jumpsuit, said she remained committed to Islam but has since rejected violent jihad.

She has cooperated on several government terrorism investigations since her arrest in 2009.

“I don’t want to be into jihad no more,” she said. “I don’t think like I used to think.”

Prosecutors declined to comment, citing forthcoming sentencing hearings for two of LaRose’s codefendants this week.