The militants of the Islamic State (IS) group had withdrawn from Tal Ali in Kirkuk province yesterday, but returned in force today and abducted some 50 people, the sources said.
It is not the first time IS 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 accused IS of "systematic ethnic cleansing," including mass killings, of ethnic and religious minorities in Iraq.
IS-led militants launched a lightning offensive in the north in June, sweeping through much of the Sunni Arab heartland north and west of Baghdad before turning on Christian and Yazidi areas.
Iraqi security forces, now bolstered by thousands of Shiite militiamen as well as Kurdish fighters, have clawed back some ground northeast of Baghdad.
But significant areas, including parts of Kirkuk province, remain under militant control.