Syringe used to threaten in Perth robbery

A man has been charged after he allegedly entered a Perth woman's home and threatened her with a syringe before stealing her handbag and mobile phone.

A man entered a woman's home before threatening her with a syringe and stealing her handbag and mobile phone, WA police say.

The man, 40, entered the 77-year-old's Perth home about 3pm on Tuesday and was taken into custody about 11pm after being spotted in Fremantle.

He has been charged with a range of offences including aggravated burglary, aggravated indecent assault and possessing a prohibited drug.