Iran has arrested a women's rights activist involved in an award-winning campaign that seeks changes to laws deemed unfair to women, a newspaper reported on Sunday.

Security officials arrested Nafiseh Azad on Saturday in the Darakeh mountains north of Tehran while she was collecting signatures for the campaign's petition, the Sarmayeh newspaper said.

It identified Azad as an activist involved with the "One Million Signatures" campaign, a grassroot initiative launched two years ago calling for equal rights for women in marriage, divorce and inheritance among other things.