Oct. 18 (Bloomberg) -- Turkey called on U.S. forces to seize Kurdish fighters in northern Iraq, as the Iraqi government warned against a Turkish invasion of the oil-rich region.

A Turkish attack on PKK units in Iraq would disrupt oil shipments and have an impact on regional security, Iraq's Foreign Minister Hoshyar Zebari said in a telephone interview from Baghdad.

Undermine Confidence

An incursion would undermine the ``atmosphere of confidence'' between the two countries, and ``definitely all trade and other things will stop,'' Zebari said. That would include oil exports, ``though Iraq is desperately in need of oil revenue,'' he said.

Thousands of people marched in northern Iraq to protest Turkish threats to send in troops, Iraqi President Jalal Talabani's political party, the Patriotic Union of Kurdistan, said on its Web site.

The EU, which is considering Turkey's membership application, urged the Turkish government to resolve its Kurdish problem peacefully