Jundallah claimed responsibility for an attack earlier this month on Shia worshippers that killed 39 people. -File Photo

CAIRO: A spokesman for Iran's armed Sunni militant group says it will kill an abducted Iranian after authorities rejected an offer to swap the hostage for 200 of the group's imprisoned members.

Jundallah spokesman Abdel Raouf Rigi is quoted Wednesday by the London-based Asharq Al-Awsat daily as saying the hostage would be killed ''very soon.''

The man was identified as a former worker at an Iranian nuclear facility who was kidnapped two months ago.

Iran on Monday hanged 11 men who authorities said were members of Jundallah, which has long waged an insurgency in the remote Sistan-Baluchistan province.

The executions took place after Jundallah claimed responsibility for an attack earlier this month on Shia worshippers that killed 39 people.