Meanwhile, Prime Minister Nuri al-Maliki broadened an amnesty offer aimed at undercutting support for jihadists, whose onslaught has have overrun areas of the country and who proclaimed a caliphate straddling Iraq and Syria.
Massud Barzani told the autonomous Kurdish region's parliament that it should make "preparations to begin to organise a referendum on the right of self-determination."
"It will strengthen our position and will be a powerful weapon in our hands," he said.
Barzani said Kurdish forces will not withdraw from northern territory they occupied after federal security forces withdrew at the beginning of the offensive, giving them control of areas they want to absorb over Baghdad's strong objections.
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Maliki rejected that yesterday, saying "no one has the right to exploit the events that took place to impose a fait accompli" and that the Kurds' steps towards self-determination had no constitutional grounding.
A police lieutenant colonel said security forces clashed Thursday with militants near Tikrit, the northern hometown of Saddam Hussein they have been unsuccessfully fighting to retake for more than a week.
Salaheddin provincial Governor Ahmed Abdullah Juburi said Wednesday security forces were "advancing slowly because all of the houses and burned vehicles (en route to Tikrit) have been rigged with explosives, and militants have deployed lots of roadside bombs and car bombs."