By John Lee.
Turkish President Recep Tayyip Erdoğan (pictured) has threatened to invade Iraq, and said he could cut off the oil export pipeline from Iraq to the Turkish port of Ceyhan, following the vote supporting independence in Iraqi Kurdistan.
"We have the tap," he said. "It is done once, we close the tap."
The pipeline typically carries between 500,000 and 600,000 barrels of crude oil per day.
In a strongly-worded speech, Erdoğan said that fighting the Iraqi Kurdish bid for independence was "a matter of survival".
His Prime Minister, Binali Yildirim, added that Ankara could take punitive measures involving borders and air space against the Kurdistan Regional Government (KRG).
Shares in Genel Energy fell 7 percent in early trading on Tuesday, but had recovered by lunchtime; Gulf Keystone Petroleum (GKP) was down 2 percent, while Norway's DNO was 5 percent higher.
(Sources: The Independent, Alliance News, Reuters, Yahoo!)