The militants of the so-called Islamic State in Iraq and the Levant (ISIL) group had withdrawn from Tal Ali in Kirkuk province on Wednesday, but returned in force on Thursday and abducted some 50 people, the sources said.
It is not the first time ISIL has carried out mass kidnappings in Iraq, with the group abducting thousands of civilians as it overran minority-populated northern villages last month, according to human rights group Amnesty International.
Amnesty has warned against ISIL’s "systematic ethnic cleansing” in Iraq, including mass killings, of ethnic and religious minorities in Iraq.
A senior UN rights official has said the group is responsible for "acts of inhumanity on an unimaginable scale."
ISIL-led militants launched a lightning offensive in the north in June, sweeping through much of north and west of Baghdad before turning on Yazidi areas.
Iraqi security forces, now bolstered by thousands of militiamen as well as Kurdish fighters, have clawed back some ground in northeast of Baghdad.
SHI/SHI