BAGHDAD — Iraqi officials discovered 50 bodies, many of them blindfolded and with their hands bound, in an agricultural area outside a city south of Baghdad on Wednesday, raising concerns over a possible sectarian killing amid the battle against a Sunni insurgency.

The lightning sweep by the insurgents over much of northern and western Iraq the past month has dramatically hiked tensions between the country’s Shiite majority and Sunni minority. At the same time, splits have grown between the Shiite-led government in Baghdad and the Kurdish autonomy region in the north.

In an address on Wednesday, Prime Minister Nouri al-Maliki accused the Kurdish zone of being a haven for the Islamic extremists and other Sunni insurgents. He did not provide any evidence, and the claims are likely to only further strain Baghdad’s ties which the Kurds, whose fighters have been battling the militant advance in the north.

The bodies, all of them with gunshot wounds, were found in the predominantly Shiite village of Khamissiya outside the city of Hillah, located some 95 kilometers (60 miles) south of Baghdad, said military spokesman Brig.