Updated May 23, 2017 14:53:50

A South Australian woman with links to the Islamic State terrorism group has been arrested, federal and state police have said.

Police will allege the woman cultivated a relationship with Islamic State online and pledged her allegiance.

Police said the 22-year-old woman from Adelaide's western suburbs was arrested earlier today after a search of a property.

They said the woman was an Australian citizen of Somali origin, and gained their attention when she tried to leave the country mid-last year.

The woman is expected to be charged with membership of a terrorist organisation.

If found guilty she could face a maximum of 10 years' jail.

AFP assistant commissioner Ian McCartney said there was no threat in Australia in relation to the case.

"The charges we've laid today against this person are serious and significant and should be not underestimated," he said.

"And to reiterate, this incident is not linked to the activity that's occurred in Manchester overnight."

More to come.

Topics: crime, law-crime-and-justice, terrorism, adelaide-5000, sa

First posted May 23, 2017 13:26:06